Patent Publication Number: US-11649629-B2

Title: Ceiling façade system

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This Application is a continuation of U.S. Non-Provisional patent application Ser. No. 17/121,530, filed on 14 Dec. 2021, which claims the benefit of U.S. Provisional Application No. 62/948,036, filed on 13 Dec. 2019, which is incorporated in its entirety by this reference. 
     This Application is related to U.S. patent application Ser. No. 16/875,079, filed on 15 May 2020, which is incorporated in its entirety by this reference. 
    
    
     TECHNICAL FIELD 
     This invention relates generally to the field of prefabricated building systems and more specifically to a new and useful ceiling façade system in the field of prefabricated building systems. 
    
    
     
       BRIEF DESCRIPTION OF THE FIGURES 
         FIG.  1    is a schematic representation of a ceiling façade system; 
         FIG.  2    is a schematic representation of one variation of the ceiling façade system; 
         FIG.  3    is a schematic representation of one variation of the ceiling façade system; 
         FIG.  4    is a schematic representation of one variation of the ceiling façade system; 
         FIG.  5    is a schematic representation of one variation of the ceiling façade system; 
         FIGS.  6 A and  6 B  are schematic representations of one variation of the ceiling façade system; 
         FIG.  7    is a schematic representation of one variation of the ceiling façade system; 
         FIG.  8    is a schematic representation of one variation of the ceiling façade system; 
         FIG.  9    is a schematic representation of one variation of the ceiling façade system; 
         FIG.  10    is a schematic representation of one variation of the ceiling façade system; 
         FIG.  11    is a schematic representation of one variation of the ceiling façade system; 
         FIG.  12    is a schematic representation of one variation of the ceiling façade system; 
         FIG.  13    is a schematic representation of one variation of the ceiling façade system; and 
         FIG.  14    is a schematic representation of one variation of the ceiling façade system. 
     
    
    
     DESCRIPTION OF THE EMBODIMENTS 
     The following description of embodiments of the invention is not intended to limit the invention to these embodiments but rather to enable a person skilled in the art to make and use this invention. Variations, configurations, implementations, example implementations, and examples described herein are optional and are not exclusive to the variations, configurations, implementations, example implementations, and examples they describe. The invention described herein can include any and all permutations of these variations, configurations, implementations, example implementations, and examples. 
     1. Ceiling Façade System 
     As shown in  FIGS.  1 ,  2  and  6 A , a ceiling façade system  100  includes a first ceiling tile  110 , which includes: an interior panel  115  defining an outer face  118 , an inner face, a first edge extending along a first side  111  of the first ceiling tile  110 , and a second edge extending along a second side  112  of the first ceiling tile  110  opposite the first edge; a heating element  180  arranged across the inner face of the interior panel  115 ; an insulator layer  117  arranged over the heating element  180  opposite the interior panel  115 ; and a rear panel  116  arranged over the insulator layer  117  opposite the interior panel  115 . The ceiling façade system  100  also includes a first receiver  120 : extending along the first side  111  of the first ceiling tile  110 ; configured to support the first side  111  of the first ceiling tile  110  on a first locating feature  145  of a linear lighting track  140  arranged on a ceiling structure  192 ; and configured to locate the first edge of the interior panel  115  of the first ceiling tile  110  adjacent and concealing the first locating feature  145  of the linear lighting track  140 . The ceiling structure  192  further includes a second receiver  130 : extending along the second side  112  of the first ceiling tile  110 ; and configured to support the second side  112  of the first ceiling tile  110  on a second locating feature  161  of a linear seam track  160  arranged on the ceiling structure  192 , the linear seam track  160  laterally offset from the linear lighting track  140 . 
     One variation of the ceiling façade system  100  shown in  FIGS.  1  and  2    includes a first linear lighting track  140 , which includes: a body  141  defining a lighting cavity  142  configured to face downwardly from a ceiling structure  192 ; a light socket  146  arranged in the lighting cavity  142  and configured to receive a light element; and a first locating feature  145  extending laterally from the body  141  opposite the lighting cavity  142  and located along a first length of the first linear lighting track  140 . In this variation, the ceiling façade system  100  also includes a linear seam track  160 : including a second locating feature  161  extending laterally toward the first locating feature  145  and located along a second length of the linear seam track  160 ; and configured to locate on the ceiling structure  192  laterally offset from the linear light track. In this variation, the ceiling façade system  100  further includes a first set of ceiling tiles  110 , each including: an interior panel  115  defining an outer face  118 , an inner face, a first edge extending along a first side  111  of the ceiling tile  110 , and a second edge extending along a second side  112  of the ceiling tile  110  opposite the first edge; a rear panel  116 ; an insulator layer  117  arranged between the interior panel  115  and the rear panel  116 ; a first receiver  120  extending along a first side  111  of the ceiling tile  110 , configured to support the first side  111  of the ceiling tile  110  on the first locating feature  145  of the first linear lighting track  140  and configured to locate the first edge of the interior panel  115  of the ceiling tile  110  adjacent and concealing the first locating feature  145  of the first linear lighting track  140 ; and a second receiver  130  extending along a second side  112  of the ceiling tile  110  and configured to support the second side  112  of the ceiling tile  110  on the second locating feature  161  of the linear seam track  160 . 
     2. Applications 
     Generally, the ceiling façade system  100  is configured to install on a ceiling structure  192  of a building  190  (e.g., an industrial building, an office building, a residential structure) to form grid arrays of ceiling tiles  110  interposed between integrated linear lighting tracks  140  that cooperate to define an overhead ceiling surface within integrated lighting, heating, cooling, ventilation, fire detection, and/or fire suppression services. 
     In particular, the ceiling façade system  100  includes linear lighting tracks  140 : that define both lighting receptacles and locating features that support and locate ceiling tiles  110 ; and are configured to mount directly to a ceiling structure  192  (e.g., with quick-connects to service receptacles on the ceiling structure  192 ). The ceiling façade system  100  also includes linear seam tracks  160 : that can be installed between and parallel to linear lighting tracks  140  in order to reduce lighting density; that include locating features that support and locate ceiling tiles  110 ; and that are concealed by ceiling tiles  110 . The ceiling façade system  100  further includes ceiling tiles  110 : configured to mount directly between two linear lighting tracks  140 , two linear seam tracks  160 , or a linear lighting and seam track pair without fasteners, clips, clamps, or other small components; that define a finished ceiling surface; that cooperate to conceal linear seam tracks  160 ; and that define finished edges that conceal unfinished edges of linear lighting tracks  140  (or that trim finished edges of linear lighting tracks  140 ) to frame lighting and ventilation elements housed in these linear lighting tracks  140 . 
     For example, each linear lighting track  140  can include: integrated locating features configured to support and align a row of ceiling tiles  110 ; a light socket  146  or integrated light element; an integrated forced air vent and baffle  148 ; a suite of integrated sensors (e.g., temperature, humidity, lighting, and smoke sensors); and an integrated sprinkler system. In this example, each linear lighting track  140  can also be mounted directly to the ceiling structure  192  and can include integrated adjustment features that enable rapid vertical repositioning of the linear lighting track  140  on the ceiling structure  192 , thereby enabling rapid leveling of ceiling tiles  110  supported between the linear lighting track  140  and an adjacent linear lighting track  140  or linear seam track  160 . Each linear lighting track  140  can further include: a single electrical connector (e.g., a “plug”) for all electrical systems (or single electrical connected for all light elements and a single, separate electrical connector for all integrated sensors) configured to connect to an electrical receptacle on the ceiling structure  192 ; a single forced air ventilation connector (e.g., a flexible duct) configured to connect to a forced air manifold on the ceiling structure  192 ; and a single water connection (e.g., a quick-connect water line) configured to connect to a sprinkler manifold on the ceiling structure  192 . Therefore: the linear lighting track  140  can be quickly fastened to the ceiling structure  192  with minimal attention paid to vertical alignment (e.g., flatness and level) of the linear lighting track  140 ; and the electrical, ventilation, and sprinkler systems in the linear lighting track  140  can be connected to their corresponding receptacles and manifolds on the ceiling structure  192  with quick, single-action (e.g., “plug and play”) connections. 
     In this example, each linear seam track  160  can be similarly fastened directly to the ceiling structure  192 , such as to known flat and level datums on the ceiling structure  192 . Alternatively, each linear seam track  160  can be integrated directly into the ceiling structure  192  during assembly of the building  190 . Furthermore, the linear lighting and seam tracks can be arranged on the ceiling at a fixed interval based on widths of the ceiling tiles  110  and widths of lighting cavities in the linear lighting tracks  140 . In particular, the linear lighting and seam tracks can be arranged: in a lighting-seam-lighting-seam track pattern for high lighting capacity; and in a lighting-seam-seam-lighting-seam-seam track pattern to reduce costs for installations necessitating lower maximum lighting capacities. (Additionally or alternatively, linear lighting tracks  140  can be installed in a lighting-lighting-lighting track pattern for maximum lighting capacity.) 
     Furthermore, in this example, ceiling tiles  110  can further include: integrated heating and/or cooling elements; and integrated insulation layers that insulate these integrated heating and/or cooling elements and the space below the ceiling tiles  110  from an overhead ceiling cavity  193 . These ceiling tiles  110  can also include quick electrical or fluid connects for coupling heating and/or cooling elements in these ceiling tiles  110  to electrical receptacles or fluid manifolds on the ceiling structure  192 . A heating and cooling surface, overhead insulation, and a finished ceiling surface can therefore be quickly installed by: plugging these quick electrical or fluid connects to their corresponding electrical receptacles or fluid manifolds on the ceiling structure  192 , slipping ends of these ceiling tiles  110  into a ceiling cavity  193  between a linear lighting and seam track pair, and then lowering these ceiling tiles  110  to engage the located features on these linear lighting and seam tracks. 
     The linear lighting track  140 , linear seam track  160 , and/or ceiling tiles  110  can further include hard or spring-loaded elements that set and control lateral gaps  153  (i.e., parallel to the linear lighting and seam tracks) and longitudinal gaps  154  (i.e., perpendicular to the linear lighting and seam tracks) between abutting ceiling tile  110 . Furthermore, once the ceiling tiles  110  are installed and supported between the linear lighting and seam tracks, vertical positions of the linear lighting tracks  140  can be adjusted via fasteners accessed within the lighting cavity  142 —and without removing ceiling tiles  110 —to set the ceiling tiles  110  flat and level across the entire ceiling façade system  100 . 
     Therefore, the ceiling façade system  100  can define a finished ceiling system: with fully integrated lighting, heating, cooling, ventilation, fire detection, and/or fire suppression services; that installs rapidly with no onsite modification or custom fitting of ceiling tiles  110 ; that enables rapid adjustment for vertical alignment of ceiling tiles  110  across a ceiling area; that enables simple inspection and validation of electrical, heating, cooling, ventilation, and fire-related services installed on the ceiling structure  192  both before and after installation of the ceiling façade system  100 ; and that includes no visible fasteners. 
     The ceiling façade system  100  is described herein as configured to install over a structure roof system in a residential structure (e.g., a single-family home, a residential accessory dwelling unit)—such as described in U.S. patent application Ser. No. 16/875,079—to form a finished ceiling surface with integrated lighting, heating, cooling, ventilation, fire detection, and/or fire suppression services. However, the ceiling façade system  100  can additionally or alternatively be installed: on a ceiling structure  192  of a multi-story industrial, commercial, or residential building; on a roof structure of a single-story industrial, commercial, or residential building; or on any other roof or ceiling structure  192  to form a finished ceiling surface with integrated lighting, heating, cooling, ventilation, fire detection, and/or fire suppression services. 
     3. Ceiling Tile 
     Generally, a ceiling tile  110  of the ceiling façade system  100  includes: an interior panel  115  defining an outer face  118 , an inner face, a first edge extending along a first side  111  of the ceiling tile  110 , and a second edge extending along a second side  112  of the ceiling tile  110  opposite the first edge; a rear panel  116 ; and an insulator layer  117  arranged between the interior panel  115  and the rear panel  116 , as shown in  FIGS.  1 ,  6 A, and  6 B . As described below, the ceiling tile  110  can further include: a first receiver  120  extending along a first side  111  of the ceiling tile  110 , configured to support the first side  111  of the ceiling tile  110  on the first locating feature  145  of the first linear lighting track  140  and configured to locate the first edge of the interior panel  115  of the ceiling tile  110  adjacent and concealing the first locating feature  145  of the first linear lighting track  140 ; and a second receiver  130  extending along a second side  112  of the ceiling tile  110  and configured to support the second side  112  of the ceiling tile  110  on the second locating feature  161  of the linear seam track  160 . Generally, the ceiling tile  110  defines a rigid, insulated panel including both a pre-finished interior surface and features configured to engage locating features on the linear lighting and seam tracks. 
     3.1 Interior Panel 
     In one implementation, the interior panel  115  includes a thin, square or rectangular sheetmetal (e.g., aluminum, steel) element with hemmed edges. In this implementation, the interior panel  115  can define a smooth outer face, such as painted with a glossy or flat paint to form a pre-finished interior surface. 
     Alternatively, a vinyl cover, wood veneer, a thermoplastic or a thermoset polymer coating, or melamine layer can be stretched or applied over the outer face of the interior panel  115  to form the pre-finished interior surface. 
     Yet alternatively, the outer face of the interior panel  115  can be coated with a colored cementitious material to form a sound-dampening pre-finished interior surface. 
     Additionally or alternatively, the interior panel  115  can be embossed, such as with a repeating hexagonal pattern or a repeating sawtooth pattern for sound-dampening. 
     However, the interior panel  115  of the ceiling tile  110  can be of any other material, geometry, or surface finish. 
     3.2 Rear Panel 
     The rear panel  116  can be of a similar material and geometry as the interior panel  115 , such as a thin, square or rectangular sheetmetal element with hemmed edges. Alternatively, the rear panel  116  can be formed or fabricated in a plywood panel, a pressed wood panel, paper, a gypsum panel (e.g., a fire-rated gypsum backer board), a fiber cement panel, or any other material. 
     3.2 Receivers 
     The ceiling tile  110  also includes a first receiver  120  and a second receiver  130 : arranged on opposing sides of the ceiling tile  110 ; extending longitudinally parallel to the linear lighting and seam tracks; and configured to mate with locating features on the linear lighting track  140  and linear seam track  160 , respectively, to locate and suspend the ceiling tile  110  from the ceiling structure  192 . 
     In one implementation, the first receiver  120 : extends along the first side  111  of the ceiling tile  110 ; is configured to support the first side  111  of the ceiling tile  110  on a first locating feature  145  of a linear lighting track  140  arranged on a ceiling structure  192 ; and configured to locate the first edge of the interior panel  115  of the ceiling tile  110  adjacent and concealing the first locating feature  145  (and an unfinished edge) of the linear lighting track  140 . In this implementation, the second receiver  130 : extends along the second side  112  of the ceiling tile  110 ; and is configured to support the second side  112  of the ceiling tile  110  on a second locating feature  161  of a linear seam track  160  arranged on the ceiling structure  192 , the linear seam track  160  laterally offset from the linear lighting track  140 . 
     In this implementation, the first and second receivers  120 ,  130  can define flat, linear surfaces that fall in a common horizontal plane parallel to the outer face  118  of the ceiling tile  110 . The corresponding locating feature on the linear lighting and seam tracks can similarly define flat, linear surfaces that fall in a common horizontal plane. Thus, when the ceiling tile  110  is installed on a linear lighting and seam track pair with the first and second receivers  120 ,  130  mating with the corresponding first and second locating features  145 ,  161  on the linear lighting and seam track pair, as described below, the first and second receivers  120 ,  130  impart a vertical load only into the first and second locating features  145 ,  161  such that the ceiling tile  110  does not fall into a “low” position between the first and second locating features  145 ,  161 . Accordingly, a spring-loaded element  151  on the ceiling tile  110  or adjacent element of the ceiling façade system  100  may drive the ceiling tile  110  toward an adjacent ceiling tile  110  to close and control a gap between the ceiling tile  110  and the adjacent ceiling tile  110 , as described below. Alternatively, an installer may manually push rows or columns of such ceiling tiles  110  together to close gaps between adjacent ceiling tiles  110 ; because the first and second receivers  120 ,  130  impart a vertical load only into the first and second locating features  145 ,  161 , the ceiling tiles  110  may remain in the position thus set by the installer. 
     In one example, the first and second receivers  120 ,  130  can include aluminum U-channel extrusions and can be integrated into the ceiling tile  110  with the cavities defined by these U-channel extrusions facing laterally outward from the ceiling tile  110 , as shown in  FIG.  6 A . In a similar example, the first and second receivers  120 ,  130  are formed of folded sheetmetal structures separately from the interior and rear panels  115 ,  116 . 
     In another implementation, the rear panel  116  (or the interior panel  115 ) of the ceiling tile  110  and the first and second receivers  120 ,  130  are physically coextensive—that is, formed from a common structure. For example, the rear panel  116 , the first receiver  120 , and the second receiver  130  can be formed from a single folded sheetmetal structure in which: a first 90° return and 90° flange extending from a first hem along a first edge of the rear panel  116  forms the first receiver  120 ; and a second 90° return and 90° flange extending from a second hem along the second, opposing edge of the rear panel  116  forms the second receiver  130 . 
     In one variation, the first and second receivers  120 ,  130  define surfaces that slope downwardly toward the lateral center of the ceiling tile  110  when the ceiling tile  110  is installed between the linear lighting and seam track pair. In this variation, the first and second locating features  145 ,  161  of the linear lighting and seam tracks can define complementary sloped surfaces such that the ceiling tile  110  settles (or “falls”) to a “low” position between the linear lighting and seam tracks to set a lateral position of the ceiling tile  110  between the linear lighting and seam tracks. 
     However, the first and second receivers  120 ,  130  can define any other linear geometry configured to mate with corresponding locating features on the linear lighting and seam tracks. 
     (In one variation, the first receiver  120  and the first locating feature  145  can define a pin and receiver pair (e.g., respectively or vice versa) arranged on the ceiling tile  110  and the linear lighting track  140  and that cooperate to constrain the first side of the ceiling tile  110  vertically on the linear lighting track  140 . Similarly, in this variation, the second receiver  130  and the second locating feature  161  can define a pin and receiver pair (e.g., respectively or vice versa) arranged on the ceiling tile  110  and the linear seam track  160  and that cooperate to constrain the second side of the ceiling tile  110  vertically on the linear seam track  160 .) 
     3.4 Insulator Layer and Assembly 
     The insulator layer  117  is arranged between and offsets the interior and rear panels  115 ,  116  and is configured to thermally and acoustically insulate the interior panel  115  from the ceiling structure  192  above. 
     In one implementation, to fabricate the ceiling tile  110 , the interior and rear panels  115 ,  116  are retained and offset in a ceiling tile jig by a target final thickness of the ceiling tile  110 . In the variation described below in which the ceiling tile  110  includes a heating element  180 , the heating element  180  is located against, bonded to, or fastened to the inner face of the interior panel  115 . In this implementation, the receivers are located along the ceiling tile  110  periphery defined by the jig and between the inner and rear panels  115 ,  116 . An expanding foam is then injected—such as through an opening (or “window,” “bore”) in the rear panel  116 —into an enclosed volume thus defined between the interior panel  115 , the rear panel  116 , and the receivers. For example, isocyanate and polyol resin can be injected into the opening in the rear panel  116  and that expands to form closed-cell polyurethane foam that: fills the ceiling tile  110 ; bonds the heating element  180 , receivers, rear panel  116 , and interior panel  115  to form a single, rigid ceiling tile  110  assembly; retains the heating element  180  against the interior panel  115 ; and insulates the interior panel  115  and heating element  180  from the rear panel  116 . 
     In this implementation, the ceiling tile jig can define hard points (or “datums”) that accurately repeatably locate the interior panel  115 , the rear panel  116 , and the receivers such that ceiling tiles  110  assembled in the ceiling tile jig exhibit similar flatness, overall widths, overall lengths, overall thicknesses, and/or distances between receivers within a narrow tolerance (e.g., +/−0.010″ per linear foot of ceiling tile  110  length). For example, the ceiling tile jig can define hard points that: locate the outer face  118  of the interior panel  115  across a plane; locate the receivers parallel to the outer face  118  of the interior panel  115 ; locate the opposing receivers at a target offset distance corresponding to the distance between adjacent linear lighting and seam tracks installed on the ceiling structure  192 ; and/or offset the receivers from the outer face  118  of the interior panel  115  by a “drop distance” to obscure linear lighting and seam tracks behind edges of the interior panel  115  of the ceiling tile  110  once installed. 
     Additionally or alternatively, in the foregoing implementation, the interior panel  115 , the rear panel  116 , the receivers, and/or the heating element  180  of the ceiling tile  110  can be fastened or bonded together prior to injection of the expanding foam into the enclosed volume formed by these components, such as with threaded fasteners, rivets, or an adhesive. 
     In another example, the insulator layer  117  includes a precast foam panel, and the interior and rear panels  115 ,  116  of the ceiling tile  110  are bonded to the front and rear faces of the foam panel, respectively to form the ceiling tile  110 . In the variation described below in which the ceiling tile  110  also includes a heating element  180 , a cavity for the heating element  180  can be cast into the foam panel; the heating element  180  can therefore be installed in the cavity in the insulator layer  117  before the interior panel  115  is bonded to the foam panel. In this variation, the heating element  180  can also be potted into the cavity and/or against the interior panel  115 , such as with a silicone caulk or expanding foam. 
     However, the insulating layer can be of any other material, can define any other format, and can be assembled or formed between the interior and rear panels  115 ,  116  of the ceiling tile  110  in any other way. 
     4. Linear Seam Track 
     As shown in  FIG.  5   , the linear seam track  160 : includes a second locating feature  161  extending laterally toward the first locating feature  145  and located along a second length of the linear seam track  160 ; and is configured to locate on the ceiling structure  192  laterally offset from the linear light track. 
     Generally, the linear seam track  160  includes a pair of horizontally-opposed second locating features  161  configured to support—and to be concealed by—ends of two abutting ceiling tile rows. In one implementation, the linear seam track  160  is configured to fasten directly to the ceiling structure  192 . For example, the linear seam track  160  can include an extruded structure (e.g., an aluminum extrusion) or a folded sheetmetal (e.g., steel) structure defining an “I” profile in which: the flanges extending from the top of the linear seam track  160  include through-bores through which the linear seam track  160  is fastened to the ceiling structure  192 ; and the flanges extending from the bottom of the linear seam track  160  form a pair of second locating features  161 , as shown in  FIG.  1   . 
     In a similar implementation, the linear seam track  160  includes a cast, extruded, or folded structure defining a “T” profile. In this implementation, the top of the “T” profile of the linear seam track  160  can define a top flange extending laterally from each side of the spine  163  of the linear seam track  160  to define a mounting flange including a series of bores through which the linear seam track  160  mounts to the ceiling structure  192 . In this implementation and as shown in  FIGS.  2  and  9   , each side of this top flange can also include: a step extending below the top flange (e.g., by height approximating a target ceiling cavity  193  depth between installed ceiling tiles  110  and the ceiling structure  192 ); and a secondary flange extending laterally outward from the step to form a second locating feature  161 . Furthermore, in this implementation, the spine  163  of the linear seam track  160  can extend downwardly to form a hard stop  162  (e.g., a datum) configured to: abut corresponding features of ceiling tiles  110  installed on the linear seam track  160 ; set a lateral offset between abutting edges of these ceiling tiles  110 ; and thus set and control a gap between the abutting edges of these ceiling tiles  110 . For example, in this implementation, the adjacent linear lighting track  140  can include a spring-loaded element  151  or threaded element  152  extending laterally toward the linear seam track  160  and configured to bias a ceiling tile  110 —installed between this linear lighting and seam track pair—toward the linear seam track  160  such that a second edge of this ceiling tile  110  (or a secondary feature adjacent and inset rearward from the second edge of the ceiling tile  110 ) engages the spine  163  of the linear seam track  160 , thereby setting the lateral position of the ceiling tile  110  between the linear lighting and seam track pair and controlling a gap between the second edge of the ceiling tile  110  and the second edge of an adjacent ceiling tile  110  installed on the opposing side of the linear seam track  160 . 
     Therefore, in the foregoing implementation, the linear seam track  160  can include: a flange configured to fasten against the ceiling structure  192 ; a pair of opposing locating features  161  extending and offset from the flange; and spine  163  that defines an integrated datum laterally locating abutting rows of ceiling tiles  110  and setting a lateral gap  153  between these ceiling tile rows. (Alternatively, in a similar implementation, the second locating features  161  of the linear seam track  160  can extend laterally from the spine  163  of the linear seam track  160  rather than the top flange of the linear seam track  160 , such as to accommodate taller ceiling cavity  193  heights between installed ceiling tiles  110  and the ceiling structure  192 .) The spine  163  can also mate with edges of the rear panels  116  of two adjacent ceiling tiles in order to set the visible gap between these two ceiling tiles  110  while also remaining hidden behind these ceiling tiles. 
     In the foregoing implementations, the linear seam track  160  can therefore be fastened to the ceiling structure  192  with a set of threaded fasteners. Additionally or alternatively, the linear seam track  160  can be: riveted to the ceiling structure  192 ; bonded to the ceiling structure  192 ; or installed on the ceiling structure  192  with a set of clips integrated into the ceiling structure  192 . 
     In another implementation, the linear track includes: a cast, extruded, or folded structure defining an “inverted-T” profile; and a set of threaded rods extending from the spine  163  of the linear seam track  160 . In this implementation, the linear seam track  160  can be: fastened to the ceiling structure  192  by passing the threaded rods through corresponding through-bores in the ceiling structure  192 ; or casting these threaded rods into a cast (e.g., concrete, foam) ceiling structure  192 . 
     However, the linear seam track  160  can define any other material or geometry and can be installed on or integrated into the ceiling structure  192  in any other way. 
     Furthermore, the linear seam track  160  can be manufactured in long lengths (e.g., 40 feet) and cut to length to span the full length of a space in a particular installation, such as in the example described above in which the linear seam track  160  defines an aluminum extrusion. 
     Additionally or alternatively, linear seam tracks  160  can be manufactured in a fixed length (e.g., eight feet) and then assembled to form a longer assembly that spans the full length of a space in a particular installation, such as in the example described above in which the linear seam track  160  defines a folded sheetmetal structure. 
     5. Linear Lighting Track 
     As shown in  FIG.  4   , the linear lighting track  140  includes: a body  141  defining a lighting cavity  142  facing downwardly from the ceiling structure  192 ; and a light socket  146  arranged in the lighting cavity  142  and configured to receive a light element. Generally, the linear lighting track  140  is configured to fasten to the ceiling structure  192 , defines a lighting cavity  142  configured to house a group of services (e.g., lighting, forced-air ventilation, fire-detection, and/or fire-suppression); and is configured to support a row of ceiling tiles  110  along on one or both sides of the lighting cavity  142 . 
     5.1 Body and First Location Features 
     In one implementation shown in  FIGS.  1  and  7   , the linear lighting track  140  includes: a body  141  (or a “light track housing”) that forms the lighting cavity  142 ; and a flange that extends from each side of the body  141  to form first locating features  145  configured to locate and support first sides  111  of ceiling tiles  110 . 
     For example, the body  141  can include an extruded aluminum or folded sheetmetal (e.g., steel) structure defining an “inverted-U” profile extending linearly along the length of the linear lighting track  140 . In this example, the linear lighting track  140  can also include a flange extending laterally from each side of the U-profile of the body  141 —and offset below the base of the U-profile by a height approximating the target ceiling cavity  193  depth between installed ceiling tiles  110  and the ceiling structure  192 . In this example, the body  141  and these flanges can form a unitary structure, such as in the form of an aluminum extrusion or a folded sheetmetal structure. Alternatively, the body  141  and these flanges can be fabricated separately and subsequently bonded, welded, riveted, or otherwise assembled to form the linear lighting track  140 . 
     Furthermore, a return of the U-profile of the body  141  can extend below the first locating features by a length approximating (e.g., slighting less than) a distance: from the outer face  118  of the first receiver  120 —on a ceiling tile  110 —that mates with the first locating feature  145  on the linear lighting track  140 ; to the rear face of the interior panel  115  of the ceiling tile  110 . Therefore, when a ceiling tile  110  is installed on the linear lighting track  140 , the return of the body  141  extends very near (e.g., inset by a nominal gap width of 0.10″) the first end of the interior panel  115  of the ceiling tile  110  that overlaps this end of the body  141 . For example, for a 3″-thick ceiling tile  110  with a nominal distance of 2.5″ between the outer face  118  of the first receiver  120  and the rear face of the interior panel  115  and for a nominal gap width of 0.10″, each return of the U-profile of the body  141  can be offset below the first locating features  145  of the linear lighting track  140  by a nominal distance of 2.40″. Therefore, the returns of the body  141  can conceal the sides of abutting ceiling tiles  110  and the receivers on the sides of these ceiling tiles  110  when the ceiling façade system  100  is assembled. 
     However, the body  141  and first locating features  145  of the linear lighting track  140  can define any other geometry or material. 
     5.2 Linear Lighting Track Length 
     Furthermore, the linear lighting track  140  can be manufactured in long lengths (e.g., 40 feet) and cut to length to span the full length of a space in a particular installation, such as in the example described above in which the body  141  and first located features of the linear lighting track  140  define an aluminum extrusion. 
     Additionally or alternatively, linear lighting tracks  140  can be manufactured in a fixed length (e.g., eight feet) and then assembled to form a longer assembly that spans the full length of a space in a particular installation, such as in the example described above in which the body  141  and first located features of the linear lighting track  140  define a folded sheetmetal structure. 
     5.3 Light Socket 
     Furthermore, the linear lighting track  140  includes a set of light sockets  146  (or integrated light elements) arranged in the lighting cavity  142 . For example, the linear lighting track  140  can include a set of light sockets  146 —configured to locate and power circular light elements—arranged at fixed intervals along the length of the linear lighting track  140 . Alternatively, the linear lighting track  140  can include: a light track arranged in the lighting cavity  142 ; and a set of light sockets  146  adjustably mounted to the light track, thereby enabling a user to adjust density of light elements along the length of the linear lighting track  140 . In yet another implementation, the linear lighting track  140  includes one or more light sockets  146  configured to locate and power linear light elements, such as linear fluorescent tube lights or an LED string. 
     Furthermore, the linear lighting track  140  can include a single electrical connector: connected to each light socket  146  in the linear lighting track  140 ; and configured to plug into a switched electrical receptacle on the ceiling structure  192  (or on an adjacent wall structure  194  or on an adjacent linear lighting track  140 ). Thus, an installer may fasten the linear lighting track  140  to the ceiling structure  192  and then plug the electrical connector directly into the electrical receptacle on the ceiling structure  192  (or on an adjacent wall structure  194  or on an adjacent linear lighting track  140 ) to complete installation of the linear lighting track  140 . 
     5.4 Sensors 
     In one variation, the linear lighting track  140  further includes an integrated suite of sensors arranged within the lighting cavity  142 . For example, the linear lighting track  140  can include a sensor cluster including: a smoke detector; a humidity sensor; an ambient light level sensor; a motion sensor; and/or a temperature sensor. The linear lighting track  140  can also include multiple sensor clusters arranged along the length of the linear lighting track  140 . 
     In this variation, the linear lighting track  140  can also include a processor configured to convert analog signals from these sensors into digital signals. In this implementation, the single electrical connector described above can include both: power lines configured to supply current from the electrical receptacle to the light sockets  146  to power the light element; and a data line configured to return digital sense signals from the processor to the electrical receptacle (which may route these digital sense signals to a primary controller in the building  190 ). Alternatively, in this variation, the sensors and/or the processor can be connected to a second, discrete electrical connector configured to connect to the electrical receptacle or to another low-power receptacle on the ceiling structure  192 . 
     Furthermore, in this variation, the linear lighting track  140  can include multiple sensor clusters arranged along its length. However, in this variation, the linear lighting track  140  can include any other type or arrangement of sensors within or coupled to the lighting cavity  142 . 
     5.5 Sprinkler 
     In one variation, the linear lighting track  140  further includes: an integrated local manifold and sprayers (or “sprinklers”) for fire suppression. 
     In one example, the linear lighting track  140  includes: a row of sprayers arranged at intervals along the length of the linear lighting track  140 , such as arranged longitudinally between light sockets  146  along the length of the linear lighting track  140 ; a local manifold that fluidly couples these sprayers; and a flexible fluid light within a quick-connect fluid coupling connected to the local manifold. In this example, during assembly, an installer may install the linear lighting track  140  on the ceiling structure  192 , as described below, and the plug the quick-connect fluid coupling into a water supply (e.g., a port of a primary manifold) on the ceiling structure  192  or on an adjacent ceiling tile  110  to complete assembly of a fire suppression system within the building  190 . 
     5.6 Mounting 
     In one implementation, the linear lighting track  140  is configured to mount to the ceiling structure  192  with the linear lighting track  140  constrained in lateral and longitudinal location on the ceiling structure  192  and adjustable vertically on the ceiling structure  192 , thereby enabling the vertical adjustment of first edges of ceiling tiles  110  installed on the linear lighting track  140  in order to set these ceiling tiles  110  in a flat, level, and flush condition. 
     For example, in this implementation, the linear lighting track  140  can include: a spring element  150  configured to bias the linear lighting track  140  downward from the ceiling structure  192 ; and a fastener configured to mount the linear lighting track  140  to the ceiling structure  192 ; and adjustable to offset the first locating feature  145  below the ceiling structure  192 , locate the first locating feature  145  parallel to the second locating feature  161 , and locate outer faces  118  of interior panels  115  of ceiling tiles  110  in the first row of ceiling tiles  110  coplanar with outer faces  118  of interior panels  115  of ceiling tiles  110  in the second row of ceiling tiles  110 . 
     In particular, in this example, the linear lighting track  140  includes a series of slots (or through-bores) spaced along the top of the body  141  of the linear lighting track  140  (e.g., the base of the lighting cavity  142 ). In this example, a threaded fastener (e.g., a fine-thread machine screw) may be inserted through a slot in the linear lighting track  140  and threaded into a corresponding threaded bore or nuts (e.g., a riv-nut, a pem-nut) located on the ceiling structure  192 . During assembly, a spring element  150  can be arranged over this threaded fastener and located between the body  141  of the linear lighting track  140  and the ceiling structure  192  such that the spring element  150  biases the linear lighting track  140  downward and off of the ceiling structure  192 . This fastener and spring element  150  assembly can be repeated at each slot location on the linear lighting track  140 . 
     In this example, the heads of these fasteners can be accessible within the lighting cavity  142 —even with ceiling tiles  110  installed on each side of the linear lighting track  140 . An installer may therefore raise a local section of the linear lighting track  140  (i.e., on each side of a fastener and spring element assembly) toward the ceiling structure  192 —and thus raise the first side  111  of an adjacent ceiling tile  110  relative to the second side  112  of this ceiling tile  110  supported on the adjacent linear seam track  160 —by tightening the threaded fastener(s) within this local section of the linear lighting track  140 . Similarly, the installer may lower this local section of the linear lighting track  140  from the ceiling structure  192 —and thus lower the first side  111  of the adjacent ceiling tile  110  relative to the second side  112  of the ceiling tile  110 —by loosening the threaded fastener(s) within this local section of the linear lighting track  140 . The linear lighting track  140  can therefore include a row of slots and fastener/spring assemblies that enable the installer to quickly level all ceiling tiles  110  across a ceiling (i.e., bring the outer faces of these ceiling tiles  110  to a common plane, such as within a tolerance of 0.05″ over ten feet lateral or longitudinal distance) by adjusting these threaded fasteners and without removing any ceiling tiles  110 , light elements, grills, or trim, etc. from the ceiling assembly. 
     Furthermore, the linear lighting track  140  can also include two parallel rows of slots and fastener/spring assemblies along the length of the linear lighting track  140 . Thus, in this example, the installer may tighten fasteners in the first row to raise a first side  111  of the linear lighting track  140  and loosen fasteners in the second row to lower a second side  112  of the linear lighting track  140 , thereby: changing a roll angle of the linear lighting track  140  (i.e., rolling the linear lighting track  140  toward the first side  111  of the linear lighting track  140 ); raising the first sides  111  of ceiling tiles  110  installed on the first side  111  of the linear lighting track  140 ; and lowering the first sides  111  of ceiling tiles  110  installed on the second side  112  of the linear lighting track  140 . Therefore, the linear lighting track  140  can include two parallel rows of slots and fastener/spring assemblies to enable the installer to set the roll position of the linear lighting track  140  and to bring first ends of ceiling tiles  110 —installed on each side of the linear lighting track  140 —into a flat and level condition. 
     Alternatively, the linear lighting track  140  can include: a single row of slots and fastener/spring assemblies centered along the length of the linear lighting track  140 ; and two rows of threaded bores arranged on each side of the row of slots. In this example, secondary vertical locking fasteners (e.g., set screws) can be installed in each of these threaded bores and tightened against the ceiling structure  192  to: mechanically prevent lifting of the linear lighting track  140  against the spring elements  150  and toward the ceiling structure  192 ; and to enable roll adjustment of the linear lighting track  140  against the ceiling structure  192 , such as by tightening secondary vertical locking fasteners in the first row of threaded bores and loosening secondary vertical locking fasteners in the second row of threaded bores. 
     However, the linear lighting track  140  can include any other adjustment element or feature configured to enable vertical height adjustment and/or roll adjustment of the linear lighting track  140  on the ceiling structure  192 . 
     Alternatively, the linear lighting track  140  can be configured to rigidly mount to the ceiling structure  192 , such as with threaded fasteners, ceiling clips, and/or an adhesive, as shown in  FIGS.  2  and  3   . 
     6. Receiver and Locating Feature Geometry 
     Therefore, the first locating feature  145  of a linear lighting track  140  includes a flange extending laterally from the body  141  opposite the lighting cavity  142 . Accordingly, the first receiver  120  of a ceiling tile  110  defines a first recess extending longitudinally along the first side  111  of the ceiling tile  110  and configured to receive the first locating feature  145  of the linear lighting track  140 . Furthermore, the first edge of the interior panel  115  of a ceiling tile  110 : defines a projection extending laterally from the first recess defined by the first receiver  120 ; and extends over a portion of the lighting cavity  142  of the linear lighting track  140  and conceals a portion of the body  141  of the linear lighting track  140  when the ceiling tile  110  is installed between the linear lighting track  140  and a linear seam track  160 . 
     Similarly, a linear seam track  160  includes a second locating feature  161  that extends laterally along a length of the linear seam track  160 . Accordingly, the second receiver  130  of a ceiling tile  110  defines a second recess extending longitudinally along the second side  112  of the ceiling tile  110 . Furthermore, the second edge of the interior panel  115 : defines a projection extending laterally from the second recess defined by the second receiver  130 ; extends over the second locating feature  161  of the linear seam track  160  when the ceiling tile  110  is installed between the linear lighting track  140  and the linear seam track  160 ; and cooperates with a second ceiling tile  110 —installed on the linear seam track  160  adjacent the ceiling tile  110 —to conceal the linear seam track  160  when the ceiling tile  110  is installed on the linear lighting track  140  and the linear seam track  160 . 
     To enable the lateral positional adjustment of the ceiling tile  110  between the linear lighting and seam tracks and to enable an installer to first install the first side  111  of the ceiling tile  110  on the linear lighting track  140  and raise the second side  112  onto the linear seam track  160  (or vice versa) before centering the ceiling tile  110  between the linear lighting and seam tracks: the first locating feature  145  of the linear lighting track  140  can define a first lateral width (e.g., 1″) and a first thickness (e.g., 0.060″); the first receiver  120  can defines a second lateral depth (e.g., 1″) and a second height greater (e.g., 2.5″) than first thickness; and the first edge of the interior panel  115  of the ceiling tile  110  can extend laterally from the recess by a third length (e.g., 1.75″) greater than first lateral width and less than a sum of the first lateral width and the second lateral width. For example, a first lateral width of 1″, a second lateral depth of 1″, and a third length of 1.75″ can provide between 0.25″ and 1″ of lateral engagement between the first receiver  120  and the first locating feature  145  with up to +/−0.375″ of lateral positional adjustment of the ceiling tile  110  on the linear lighting track  140 . 
     The linear seam track  160  and the second receiver  130  of the ceiling tile  110  can define a similar geometry. For example, the second locating feature  161  can define a lateral width of 1″, the second receiver  130  can define a lateral depth of 1″, and the second edge of the interior panel  115  can extend beyond the second receiver  130  by a length of 1.75″ to provide between 0.25″ and 1″ of lateral engagement between the second receiver  130  and the second locating feature  161  with up to +/−0.375″ of lateral positional adjustment of the ceiling tile  110  on the linear seam track  160 . 
     7. Installation: Linear Lighting and Seam Tracks 
     To install the ceiling façade system  100  on a ceiling structure  192 , an installer may fasten a set of linear lighting tracks  140  and linear seam tracks  160  to the ceiling structure  192 . For example, for an installation with moderate lighting requirements, the installer may install linear lighting tracks  140  and linear seam tracks  160  in a lighting-seam-lighting-seam track pattern. In this example, the installer may offset a linear seam track  160  from an adjacent linear lighting track  140  by a lateral center-to-center distance approximately equal to: the sum of the width of a ceiling tile  110  (e.g., 4′) and half the width of the light cavity of the linear lighting track  140  (e.g., half of 6″); less a minimum overlap distance of the first edge of the interior panel  115  of the ceiling tile  110  into the lighting cavity  142  of the linear lighting track  140  (e.g., 0.25″); and less half a target gap width between the second edge of ceiling tiles  110  abutting at the linear seam track  160  (e.g., 0.125″). 
     The installer may then install a first ceiling tile  110  between a linear lighting and seam track pair by: angling the first side  111  of the ceiling tile  110  toward the ceiling structure  192 ; setting the first receiver  120  on the first side  111  of the ceiling tile  110  onto the first locating feature  145  of the linear lighting track  140 ; pushing the first end of the ceiling tile  110  toward the linear lighting track  140  to engage the first receiver  120  against the first locating feature  145 ; raising the second end of the ceiling tile  110  toward the second locating feature  161  of the linear seam track  160 ; raising the second receiver  130  of the ceiling tile  110  above the second locating feature  161  of the linear seam track  160 ; shifting the ceiling tile  110  laterally toward the linear seam track  160 ; and releasing the ceiling tile  110  to enable the second receiver  130  to engage the second locating feature  161 . The first and second receivers  120 ,  130  of the ceiling tile  110  can thus support the ceiling tile  110  on the first and second locating features  145 ,  161  of the linear lighting and seam tracks, respectively. Furthermore, the first edge of the interior panel  115  of the ceiling tile  110  can extend into the lighting cavity  142  to conceal the near side of the linear lighting track  140  (e.g., the edge of the near return of the body  141  of the linear lighting track  140 ); and the second end of the ceiling tile  110  can extend over and conceal the near side of the linear seam track  160 . (In one variation, the ceiling tile  110  further includes a cable fastened to the rear panel  116  of the ceiling tile  110 ; during installation, the installer may also fasten the distal end of this cable to the ceiling structure  192  such that the cable catches and retains the ceiling tile  110  when lowered from the linear lighting and seam tracks when infrastructure behind the ceiling façade system  100  is serviced.) 
     The installer may repeat this process to install additional ceiling tiles  110  between this linear lighting and seam track pair in order to complete a first row of ceiling tiles  110  in the ceiling façade system  100 . The installer may repeat this process to install additional ceiling tiles  110  between this seam track and an adjacent linear lighting track  140  (or a next linear seam track  160 ) in order to complete a second row of ceiling tiles  110 —abutting the first row of ceiling tiles  110 —in the ceiling façade system  100 , as shown in  FIGS.  12 ,  13 , and  14   . The second ends of ceiling tiles  110  in the first and second ceiling tile rows can therefore extend over and fully conceal the linear seam track  160 . 
     8. Ceiling Tile Gap Control 
     After the installer locates a first row of ceiling tiles  110  between a first linear lighting track  140  and a linear seam track  160  and locates a second row of ceiling tiles  110  between the linear seam track  160  and a second linear lighting track  140 , the installer may adjust these ceiling tiles  110 : to set longitudinal gaps  154  between third and fourth sides  114  of abutting panels in these ceiling tile rows; to set the lateral positions of these ceiling tiles  110  between the linear lighting and seam tracks; and to set the lateral gap  153  between first and second edges  111 ,  112  of ceiling tiles  110  abutting at the linear seam track  160  (i.e., the lateral gap  153  between the first and second ceiling tile rows, extending longitudinally along the linear lighting and seam tracks). 
     8.1 Ceiling Tile Lateral Gap Stops 
     Generally, a lateral gap  153  between abutting ceiling tiles  110 : defines a gap between the second edge of an interior panel  115  of a first ceiling tile  110  and the second edge of an interior panel  115  of a second, abutting ceiling tile  110 ; falls adjacent the linear seam track  160 ; and runs parallel to the linear seam track  160 , as shown in  FIGS.  12 ,  13 , and  14   . 
     In one implementation shown in  FIG.  2   , the linear seam track  160  can include hard stops  162  (e.g., datums) that engage features on the first and second ceiling tiles  110  to control the lateral gap  153  between the second edges of these ceiling tiles  110 . In one example, in the T-profile linear seam track  160  described above, a step between the top flange and a second locating feature  161  of the linear seam track  160  is located laterally on the linear seam track  160  such that the rear flange of the receiver of a ceiling tile  110  engages the step—and is thus constrained laterally—when the second edge of the interior panel  115  of the ceiling tile  110  is parallel and offset from the longitudinal centerline of the linear seam track  160  by half of the target lateral gap  153  width. (In this example, the step can also define an undercut that catches the rear flange of the receiver to prevent the rear flange of the receiver from riding up the step and lifting the ceiling tile  110  when the ceiling tile  110  is driven toward the linear seam track  160 , as described below.) 
     In another example, the spine  163  of the linear seam track  160  extends downwardly from the top flange of the linear seam track  160 , and the linear seam track  160  includes a secondary flange that extends laterally from the spine  163  to engage the base of a second receiver  130  of a ceiling tile  110 —and thus laterally constrain the ceiling tile  110  relative to the linear seam track  160 —when the second edge of the interior panel  115  of the ceiling tile  110  is parallel and offset from the longitudinal centerline of the linear seam track  160  by half of the target lateral gap  153  width. 
     In yet another example, the spine  163  of the linear seam track  160  defines a thickness equal to a minimum lateral gap  153  and can extend downwardly from the second locating features  161  to engage the second edges of the interior panels  115  of these ceiling tile  110 . 
     Additionally or alternatively, the second receiver  130 , the second edge of an interior panel  115 , and/or the second edge of a rear panel  116  of a ceiling tile  110  can include tabs, flanges, or other features that extend from the second side  112  of the ceiling tile  110  to mate with the linear seam track  160 —and thus laterally constrain the ceiling tile  110  relative to the linear seam track  160 —when the second edge of the interior panel  115  of the ceiling tile  110  is parallel and offset from the longitudinal centerline of the linear seam track  160  by half of the target lateral gap  153  width. 
     Additionally or alternatively, the second receiver  130 , the second edge of an interior panel  115 , and/or the second edge of a rear panel  116  of a ceiling tile  110  can include tabs, flanges, or other features that extend from the second side  112  of the ceiling tile  110  to mate with the an abutting ceiling tile  110 —and thus laterally constrain the ceiling tile  110  relative to the abutting ceiling tile  110 —when the second edges of the interior panel  115  of these ceiling tiles  110  are parallel and offset by the target lateral gap  153  width. 
     8.2 Ceiling Tile Lateral Gap Control 
     In one implementation shown in  FIG.  1   , the ceiling façade system  100  includes a spring element  151  (e.g., a coil spring, a flat tension spring) interposed between the first side  111  of a ceiling tile  110  and a linear lighting track  140 ; and configured to bias the ceiling tile  110  toward the linear seam track  160  to close the lateral gap  153  between the second edge of the ceiling tile  110  and the second edge of an abutting second ceiling tile  110  installed on the opposing side of the linear seam track  160 . 
     For example, as shown in  FIG.  1   , a linear lighting track  140  can include pairs of spring-loaded detents  151 : facing laterally outward from the first return  143  of the linear lighting track  140 ; offset by less than the length of a ceiling tile  110  (e.g., offset by 40″ for a 48″-wide ceiling tile  110 ); and arranged along the length of the linear lighting track  140  at intervals equal to the length of a ceiling tile  110 . In this example, a pair of spring-loaded detents  151  can engage the first receiver  120  of a ceiling tile  110 —installed on the linear lighting track  140 —and apply a lateral force against the ceiling tile  110  to drive the ceiling tile  110  toward an adjacent linear seam track  160 , thereby driving the ceiling tile  110  against datums defined by the linear seam track  160  and locating the second edge of the interior panel  115  of the ceiling tile  110  parallel and offset from the longitudinal centerline of the linear seam track  160  by half of the target lateral gap  153  width. The second linear lighting track  140  on the opposing side of the linear seam track  160  can include similar spring-loaded detents  151  that drive a second ceiling tile  110  toward the linear seam track  160 . Therefore, the spring-loaded detents  151  in these linear lighting tracks  140  can automatically locate two ceiling tiles  110 —on opposing sides of the linear seam track  160 —to set the lateral gap  153  between these two ceiling tiles  110 . 
     Furthermore, in this example, the first receiver  120  of a ceiling tile  110  can include counter-bores or tapered bores configured to receive spring-loaded detents  151  when installed on the linear lighting track  140  such that the spring-loaded detents  151 : drive the ceiling tile  110  laterally toward the linear seam track  160 ; and/or constrain the linear lighting track  140  vertically on the first locating feature  145 . 
     In a similar example, the spring elements described above are integrated into the first side  111  of a ceiling tile  110  and engage the linear lighting track  140  to drive the ceiling tile  110  toward the linear seam track  160 . 
     In another implementation shown in  FIG.  7   , a linear lighting track  140  can include pairs of threaded bores and set screws  152  (or jack screws): facing laterally outward from the first return  143  of the linear lighting track  140 ; offset by less than the length of a ceiling tile  110  (e.g., offset by 40″ for a 48″-wide ceiling tile  110 ); and arranged along the length of the linear lighting track  140  at intervals equal to the length of a ceiling tile  110 . In this example, once a ceiling tile  110  is installed on the linear lighting track  140 , the installer may: reach a tool into the lighting cavity  142  to engage the set screws  152 ; and tighten the pair of set screws  152  against the first side  111  of the ceiling tile  110  (e.g., against the first receiver  120  of the ceiling tile  110 ), thereby driving the ceiling tile  110  toward the adjacent linear seam track  160 , such as until the second side  112  of the ceiling tile  110  engages a hard stop  162  on the linear seam track  160 , thereby locating the second edge of the interior panel  115  of the ceiling tile  110  parallel and offset from the longitudinal centerline of the linear seam track  160  by half of the target lateral gap  153  width. The second linear lighting track  140  on the opposing side of the linear seam track  160  can include similar threaded bores and set screws  152 , which the installer may adjust to drive a second ceiling tile  110  toward the linear seam track  160 . Therefore, the set screws  152  in these linear lighting tracks  140  can cooperate to locate and lock two ceiling tiles  110  on opposing sides of the linear seam track  160  with their second edges offset by the target lateral gap  153  width. 
     In a similar example, a linear lighting track  140  can include pairs of through-bores and captured set screws (or jack screws): facing laterally outward from the first return  143  of the linear lighting track  140 ; offset by less than the length of a ceiling tile  110  (e.g., offset by 40″ for a 48″-wide ceiling tile  110 ); and arranged along the length of the linear lighting track  140  at intervals equal to the length of a ceiling tile  110 . In this example, the first side  111  of a ceiling tile  110  (e.g., the first receiver  120  of the ceiling tile no) includes a set of threaded bores (e.g., riv-nuts) configured to receive a corresponding set of set screws installed on the linear lighting track  140 . Thus, once this ceiling tile  110  is installed on the linear lighting track  140 , the installer may: screw these set screws into corresponding threaded bores on the first side  111  of the ceiling tile  110 . By tightening these set screws, the installer may draw the ceiling tile  110  closer to the linear lighting track  140 ; by loosening these set screws, the installer may similarly drive the ceiling tile  110  toward the linear seam track  160 . These set screws can thus retain the first side  111  of the ceiling tile  110  in vertical, lateral, and longitudinal translation relative to the linear lighting track  140  and maintain the longitudinal and lateral position of the ceiling tile  110  between the linear lighting and seam tracks once set by the installer. 
     8.3 Longitudinal Ceiling Tile and Wall Gap Control 
     Generally, a longitudinal gap  154  between abutting ceiling tiles  110  defines a gap: between the third edge of an interior panel  115  of a first ceiling tile  110  and the fourth edge of an interior panel  115  of a second, abutting ceiling tile  110 ; and runs perpendicular to the linear lighting and seam tracks, as shown in  FIGS.  12 ,  13 , and  14   . 
     8.3.1 Hard Stops 
     In one implementation, the third and/or fourth side  114  of a ceiling tile  110  includes fixed, hard stops configured to mate with features on a fourth side  114  and/or third side  113  of an adjacent ceiling tile  110  to set a longitudinal gap  154  between these ceiling tiles  110 . Therefore, to set longitudinal gaps  154  between ceiling tiles  110  within a ceiling tile row, the installer may push all ceiling tiles  110  in this row—along the linear lighting and seam tracks—away from a first wall structure  194  at a first end of the linear lighting and seam tracks and toward a second wall structure  194  at the second end of the linear lighting and seam tracks. The installer may thus force hard stops on the third and/or fourth sides  114  of these ceiling tiles  110  into contact, thereby: closing and setting the longitudinal gaps  154  between these ceiling tiles  110 ; closing a second gap between the fourth edge of the last ceiling tile  110  in the row and the second wall structure  194  (or an interior wall panel  195  installed on the second wall structure  194 ); and opening a first gap between the third edge of the first ceiling tile  110  in this row and the first wall structure  194  (or an interior wall panel  195  installed on the first wall structure  194 ). 
     In this implementation, interior wall panels  195 : can be mounted to and stand off from the wall structure  194 , such as described in U.S. patent application Ser. No. 16/875,079; and can extend from the floor of the building  190  up to outer faces  118  of ceiling tiles  110  in the ceiling façade system  100 . (For example, the bottom edges of the interior wall panels  195  can be offset above the floor by a reveal height of 0.5″, and the top edges of the interior wall panels  195  can be offset below the outer faces  118  of the installed ceiling tiles  110  by a similarly reveal height of 0.25″.) 
     Furthermore, the interior wall panels  195  can be configured to standoff from the wall structure  194  by depths greater than a difference between the length of the building  190  and the minimum assembled length of a row of ceiling tiles  110  designated for this building  190  such that the first and second gaps are fully concealed by interior wall panels  195  installed on the first and second wall structures  194 . For example, a set of three 47.5″-long ceiling tiles  110 —+/−0.1″—can be installed on 143″-long linear lighting and seam tracks in a 12′-long space with 0.05″ longitudinal gaps  154  between adjacent ceiling tiles  110 , thereby yielding a minimum ceiling tile row length of 143.15″ and a maximum ceiling tile row length of 143.65″. An interior wall panel  195  can be configured to install on a wall structure  194  such that the finished interior surface of the interior wall panel  195  is offset from the wall structure  194  by 1.5″, thereby concealing a gap between 0.35″ and 0.85″ at the first end of the ceiling tile row when these ceiling tiles  110  are driven toward the second wall of the building  190  to close the longitudinal gaps  154  between these ceiling tiles  110 , as described above. 
     8.3.2 Spring-Loaded Stops 
     In another implementation, a ceiling tile  110  can include: a spring element extending from the third side  113  of the ceiling tile  110 ; and a spring element seat arranged on the fourth side  114  of the ceiling tile  110  opposite the third side  113  of the ceiling tile  110 . The spring elements in one ceiling tile  110  can thus mate with the spring element seats on an abutting ceiling tile  110  to set and control the longitudinal gap  154  between these ceiling tiles  110 ; such spring elements in ceiling tiles  110  in a ceiling tile row can thus cooperate to achieve similar longitudinal gaps  154  between all abutting ceiling tiles  110  in this ceiling tile row when these ceiling tiles  110  are driven together, such as toward one wall structure  194  of the building  190  as described above. 
     For example, a first ceiling tile  110  can include: a first spring element extending from a third side  113  of the first ceiling tile  110 , wherein the third side  113  of the first ceiling tile  110  is perpendicular to the first side  111  and the second side  112  of the first ceiling tile  110 ; and a first spring element seat arranged on a fourth side  114  of the first ceiling tile  110  opposite the third side  113  of the first ceiling tile  110 . A second ceiling tile  110  can: be configured to install between the linear lighting track  140  and the linear seam track  160 ; and include a second spring element extending from the third side  113  of the second ceiling tile  110  and configured to mate with the first spring element seat on the fourth side  114  of the first ceiling tile  110  to set a first gap between the third side  113  of the second ceiling tile  110  and the fourth side  114  of the first ceiling tile  110 . A third ceiling tile  110  can similarly: be configured to install between the linear lighting track  140  and the linear seam track  160 ; and define a third spring element seat arranged on a fourth side  114  of the third ceiling tile  110  and configured to mate with the first spring element on the third side  113  of the first ceiling tile  110  to set a second gap between the fourth side  114  of the third ceiling tile  110  and the third side  113  of the first ceiling tile  110 . Thus, the first spring element and the second spring element can cooperate to maintain a first width of the first gap at approximately a second width of the second gap. 
     However, the ceiling tiles  110  can include any other hard features or spring-loaded elements configured to control the longitudinal gaps  154  between abutting ceiling tiles  110  in the ceiling tile row. 
     9. Linear Wall Track 
     In one variation shown in  FIGS.  1 ,  2 ,  3 ,  8 ,  9 , and  10   , the ceiling façade system  100  further includes a linear wall track  170  configured to fasten to a wall—parallel to the linear lighting and seam tracks—and to support first or second ends of ceiling tiles  110 . 
     In one implementation, the linear wall track  170  defines a profile approximating a half (e.g., a left bisection) of the linear seam track  160 , including a locating feature configured to engage and support a first or second receiver  120 ,  130  of a ceiling tile  110 . In this implementation, the linear wall track  170  can be fastened to the building  190 —parallel the linear lighting and seam tracks—near an apex of a wall structure  194  and the ceiling structure  192  with the locating feature of the linear wall track  170  falling within (e.g., within flatness tolerance of 0.05″ per linear foot) a plane defined by the first and second locating features  145 ,  161  of the linear lighting and seam tracks. 
     Furthermore, like the linear seam track  160 , the linear wall track  170  can also include a hard stop (e.g., a datum) configured to laterally locate and constrain the second end of a ceiling tile  110  such that the first edge of the interior panel  115  of the ceiling tile  110  extends over and conceals a first return  143  of a linear lighting track  140  installed adjacent and offset from the linear wall track  170 . 
     However, the linear wall track  170  can define any other geometry and can be installed on the building  190  (e.g., to the ceiling and/or wall structure  194 ) in any other way. 
     10. Ceiling Flatness Control 
     Furthermore, once the linear lighting, seam, and/or wall tracks and the ceiling tiles  110  are installed on the ceiling structure  192  to complete the ceiling façade system  100 , the vertical positions of the linear lighting tracks  140  can be adjusted to bring the outer faces  118  of the ceiling tiles  110  into a common plane. 
     In one example shown in  FIG.  1   , in the implementation described above in which the linear lighting track  140  includes spring elements  150  and/or set screws configured to bias the base of the body  141  of the linear lighting track  140  off of the ceiling structure  192 , the first locating feature  145  of the linear lighting track  140  can be offset—by an offset distance—below the base of the linear lighting track  140  by less than a distance between the second locating feature  161  and the top of the linear seam track  160 . In this example, the offset distance can be 0.25″, thereby enabling the installer to adjust the vertical position of the linear lighting track  140  to accommodate for as much as 0.25″ deviation in flatness of the ceiling structure  192  between the installed locations of the linear lighting track  140  and the adjacent linear seam track  160  by tightening the linear lighting track  140  against the ceiling structure  192 . 
     Therefore, in this example, the installer may insert a tool into the lighting cavity  142  of a linear lighting track  140 , engage these fasteners with the tool, and thus adjust these fasteners to raise and/or lower sections of this linear lighting track  140  to bring outer faces  118  of rows of ceiling tiles  110  on each side of the linear lighting track  140  into a common plane and to bring outer faces  118  of rows of ceiling tiles  110  on each side of an adjacent linear seam track  160  into this plane. 
     In this variation, the linear wall track  170  can be similarly mounted to the ceiling structure  192 ; and the installer may implement similar methods to adjust the vertical position of the linear wall track  170  in order to achieve a consistent, target gap between: the outer faces  118  of ceiling tiles  110  installed along this linear wall track  170 ; and the top edges of wall panels  195  installed on the adjacent wall structure  194 . 
     11. Other Track Patterns 
     In one variation, for an installation with low lighting requirements, the installer may install linear lighting tracks  140  and linear seam tracks  160  in a lighting-seam-seam-lighting-seam-seam track pattern. In this variation, the installer may offset a linear seam track  160  from an adjacent linear seam track  160  by a lateral center-to-center distance approximately equal to: the width of a ceiling tile  110  (e.g., 4′); less half a target gap width between the second edge of ceiling tiles  110  abutting at the linear seam track  160  (e.g., 0.125″). 
     yet another variation shown in  FIG.  13   , for an installation with high lighting requirements, the installer may install linear lighting tracks  140  and linear seam tracks  160  in a lighting-lighting-seam track pattern. In this variation, the installer may offset a linear lighting track  140  from an adjacent linear lighting track  140  by a lateral center-to-center distance approximately equal to: the sum of the width of a ceiling tile  110  (e.g., 4′) and the width of the light cavities of the linear lighting tracks  140  (e.g., 6″); less twice a minimum overlap distance of the first edge of the interior panel  115  of the ceiling tile  110  into the lighting cavity  142  of the linear lighting track  140  (e.g., 0.25″). 
     11.1 Ceiling Tile Installation Between Linear Lighting Track Pair 
     After the installer locates a row of ceiling tiles  110  between two linear lighting tracks  140 , the installer may adjust these ceiling tiles  110  to set longitudinal gaps  154  between third and fourth sides  114  of abutting panels and to set the lateral positions of these ceiling tiles  110  between the linear lighting tracks  140 . 
     In one implementation as described above, the ceiling façade system  100  includes: a first set of spring elements located between the first linear lighting track  140  and the first side  111  of a ceiling tile  110 ; and a second set of spring elements located between the second linear lighting track  140  and the second side  112  of the ceiling tile  110 . In this implementation, the first and second sets of spring elements are balanced (i.e., define similar spring element constants and are located in positions mirrored across the ceiling tile  110  or between the linear lighting tracks  140 ) and apply forces toward the lateral center of the ceiling tile  110 . Thus, when the forces applied laterally across the ceiling tile  110  by these spring elements equilibrate, these spring elements can automatically center the ceiling tile  110  laterally between the first and second linear lighting tracks  140 . 
     In another implementation, the ceiling façade system  100  includes: a first row of set screws located between the first linear lighting track  140  and the first side  111  of the ceiling tile  110  (e.g., threaded through bores in the first return  143  of the body  141  of the first linear lighting track  140 ); and a second row of set screws located between the second linear lighting track  140  and the second side  112  of the ceiling tile  110  (e.g., threaded through bores in the second return  144  of the body  141  of the second linear lighting track  140 ). In this implementation, the installer may adjust the first and second rows of set screws against the first and second sides  111 ,  112  (e.g., the first and second receivers  120 ,  130 ) of the ceiling tile  110 , respectively, to adjust the lateral position of the ceiling tile  110  and to mechanically lock the ceiling tile  110  between the first and second linear lighting tracks  140 . 
     11.2 Ceiling Tile Installation Between Linear Seam Track Pair 
     Similarly, after the installer locates a row of ceiling tiles  110  between two linear seam tracks  160 , the installer may adjust these ceiling tiles  110  to set longitudinal gaps  154  between third and fourth sides  114  of abutting panels and to set the lateral positions of these ceiling tiles  110  between the linear lighting tracks  140 . 
     In one implementation, linear seam tracks  160  configured to install immediately adjacent other linear seam tracks  160  (e.g., linear seam tracks  160  in a lighting-seam-seam-lighting pattern or in a lighting-seam-seam-seam-lighting pattern) can exclude longitudinal datums configured to set lateral gaps  153  between rows of ceiling tiles  110  that abut at these linear seam tracks  160 , as described above. Rather, a ceiling tile  110  configured to abut another ceiling tile  110  over a linear seam track  160  in a lighting-seam-seam-lighting pattern or in a lighting-seam-seam-seam-lighting pattern can include integrated datums (e.g., “standoffs) configured to set the lateral gap  153  between the second edge of the ceiling tile  110  to the second edge of an abutting ceiling tile  110 . 
     Thus, in this implementation, once the installer places three rows of ceiling tiles  110  between linear lighting and seam tracks in a lighting-seam-seam-lighting pattern, the installer may adjust set screws in the linear lighting tracks  140 : to force the abutting edges of ceiling tiles  110  in the rows together over the two linear seam tracks  160 ; and to achieve similar overlapping of the first edges of ceiling tiles  110  in the first and third rows of ceiling tiles  110  over the first returns  143  of the first and second linear lighting tracks  140 , respectively. Alternatively, balanced spring elements in these linear lighting tracks  140  can drive these three rows of ceiling tiles  110  together: to automatically force the abutting edges of ceiling tiles  110  in the rows together over the two linear seam tracks  160 ; and to automatically achieve similar overlapping of the first edges of ceiling tiles  110  in the first and third rows of ceiling tiles  110  over the first returns  143  of the first and second linear lighting tracks  140 , respectively. 
     The installer may similarly set gaps between ceiling tiles  110  in four rows of ceiling tiles  110  between linear lighting and seam tracks in a lighting-seam-seam-seam-lighting pattern. 
     12. Heating-Enabled Ceiling Tile 
     In one variation shown in  FIGS.  1 ,  2 , and  6 A , a ceiling tile  110  includes: an interior panel  115  defining an outer face  118 , an inner face, a first edge extending along a first side  111  of the ceiling tile  110 , and a second edge extending along a second side  112  of the ceiling tile  110  opposite the first edge; a heating element  180  arranged across the inner face of the interior panel  115 ; an insulator layer  117  arranged over the heating element  180  opposite the interior panel  115 ; and a rear panel  116  arranged over the insulator layer  117  opposite the interior panel  115 . Generally, in this variation, the ceiling tile  110  includes an integrated heating element  180  configured to conductively heat the interior panel  115  of the ceiling tile  110 , thereby heating the space  191  below via convection and/or radiation. Thus, in this variation: the linear lighting track  140  can include integrated lighting, sensing, and/or fire-suppression services; the ceiling tiles  110  can define finished ceiling surfaces; and all or a subset of ceiling tiles  110  installed on a ceiling structure  192  can include integrated heating services. 
     In this variation, the heating element  180  can be arranged across and potted against the inner face of the interior panel  115 ; and the insulator layer  117  can include a structural foam cast in situ between the interior panel  115  and the rear panel  116  of the ceiling tile  110  such that the heating element  180  is potted against the inner face of the interior panel  115  and encapsulated by the expanding foam of the insulator layer  117 . 
     Additionally or alternatively, the heating element  180  can be clamped, bonded, or fastened directly to the interior panel  115  of the ceiling tile  110 . For example, the ceiling tile  110  can include sheetmetal brackets arranged at intervals along the heating element  180  and spot-welded to the inner face of the interior panel  115 . In another example, the heating element  180  can be bonded to the inner face of the interior panel  115  with an adhesive, and a precast insulator layer  117  and rear panel  116  assembly can be arranged over and boned to the heating element  180  and the interior panel  115  to complete the ceiling tile  110 . 
     However, in this variation, the heating element  180  can be assembled in the ceiling tile  110  in any other way. 
     12.1 Electric Heating 
     In one implementation shown in  FIG.  1   , the heating element  180  includes an electric resistance heating coil. In this implementation, the ceiling tile  110  can further include an electrical connector (e.g., a two-pronged quick-connect plug): extending from the ceiling tile  110  opposite the interior panel  115 ; configured to transiently couple to an electrical receptacle arranged on the ceiling structure  192 ; and configured to supply current from the electrical receptacle to the heating element  180  to heat the interior panel  115  of the ceiling tile  110 . Thus, when the ceiling tile  110  is installed between linear lighting and seam tracks on the ceiling structure  192 , the electrical connector can be quickly connected to the switched electrical receptacle, which selectively supplies current to the heating element  180  to heat the panel and thus the space below. 
     12.2 Fluid-Based Heating 
     In another implementation shown in  FIGS.  2  and  14   , the heating element  180  of the ceiling tile  110  includes a fluid line, such as hard copper pipe or flexible cross-linked polyethylene tubing. In this implementation, the ceiling tile  110  can further include a fluid supply connector  182 : extending from the ceiling tile  110  opposite the interior panel  115 ; configured to transiently couple to an outlet of a fluid supply manifold arranged on the ceiling structure  192  (or an outlet port arranged on an adjacent heating-enabled ceiling tile  110 ); and configured to supply heated fluid (e.g., water) from the outlet of the fluid supply manifold (or the outlet port) to the fluid line to heat the interior panel  115  of the ceiling tile  110 . 
     In this implementation, the ceiling tile  110  can similarly include a fluid return connector  184  configured to return fluid exiting the fluid heat. For example, the fluid return connector  184  can include a flexible fluid line with a quick-connect coupler configured to connect to a fluid return manifold on the ceiling. Thus, in this example: heated fluid flows from a fluid supply manifold in the ceiling in the heating element  180  via the fluid supply connector  182 ; this fluid heats the ceiling tile  110  via the heating element  180 ; cooled fluid returns to the fluid return manifold via the fluid return connector  184 ; and this cooled fluid is pumped back to a heater—in or adjacent the building  190 —which heats this fluid before a pump returns this heated fluid to the fluid supply manifold. 
     Alternatively, the fluid return connector  184  can include a return port: arranged on the rear panel  116  of the ceiling tile  110 ; configured to couple to a second fluid supply connector  182  of a second, adjacent ceiling tile  110  in the ceiling façade system  100 ; and configured to supply (heated) fluid to the second ceiling tile  110  via the second fluid supply connector  182 . For example, a fluid supply manifold and a fluid return manifold can be arranged over a heating “zone” in the space  191 , and a group of ceiling tiles  110  over this zone can be connected in series between this fluid supply manifold and a fluid return manifold. Similar fluid supply manifold, fluid return manifold, and ceiling tile  110  assemblies can be installed and connected over other heating zones within the space  191 . 
     Therefore, in this implementation, when the ceiling tile  110  is installed between linear lighting and seam tracks on the ceiling structure  192 : the fluid supply connector  182  can be quickly connected to the fluid supply manifold and/or to a return port on an adjacent ceiling tile  110 ; and the fluid return connector  184  or return port can be quickly connected to the fluid return manifold and/or to a fluid supply connected on an adjacent ceiling tile  110 , thereby enabling the installer to quickly connect and complete heating services in the building  190 . 
     In this implementation, cooled fluid (e.g., water, refrigerant) can be similarly pumped through the fluid line to cool the ceiling tile  110 . Furthermore, in this variation, both an electric resistance heating coil and a fluid line can be integrated into the ceiling tile  110  to enable both heating and cooling of the ceiling tile  110 . 
     12.3 Forced Air in Ceiling Cavity 
     In this variation, to increase the rate of heat transfer between air in the building  190  and installed ceiling tiles  110 , the ceiling façade system  100  can include a fan or blower: configured to install in or couple to the ceiling cavity  193  between the ceiling structure  192  and these ceiling tiles  110 ; and configured to pressurize the ceiling cavity  193 , thereby forcing air to flow across the rear faces of the ceiling tiles  110  and through gaps between the ceiling tiles  110 , thereby increasing heat transfer between these ceiling tiles  110  and this air, which may then flow downward to condition the space  191  below the ceiling façade system  100 . 
     In this implementation, the linear lighting tracks  140  can additionally or alternatively include: ventilation ports  147  that intake air from the ceiling cavity  193 ; and a baffle  148  that directs this air laterally across the outer faces  118  of the adjacent ceiling tiles  110 , thereby increasing heat transfer between the outer faces  118  of these ceiling tiles  110  and this air. 
     Additionally or alternatively, in this implementation, the ceiling tile  110  can include: a ventilation port  147  passing (vertically) from the rear panel  116  to the interior panel  115  of the ceiling tile  110 ; and a fan or other blower element arranged across the ventilation port  147  and configured to move air between the ceiling cavity  193  and the space  191  below in order to increase heat transfer between the ceiling tile  110  and air in the space  191  when the heating element  180  is active and in order to move air throughout the space  191  when the heating element  180  is inactive. In this implementation, the ceiling tile  110  can include a quick-connect electrical connector configured: to connect to a switch electrical receptacle on the ceiling structure  192  (or on an electrical receptacle an adjacent ceiling tile  110 ); and to supply power to this integrated fan. 
     12.4 Forced Air Through Linear Lighting Track 
     Additionally or alternatively, the linear lighting tracks  140  can include: a ventilation port  147  configured to couple to a forced-air heating system within the building  190 ; and a baffle  148  arranged in the linear lighting track  140  and configured to distribute conditioned air—entering the linear lighting track  140  via the ventilation port  147 —along a portion of the length of the linear lighting track  140 . 
     13. Window Shade 
     Furthermore, in one variation shown in  FIGS.  11  and  14   , a ceiling tile  110  designated for installation adjacent a window includes a shade recess  119 : that runs along the window when the ceiling tile  110  is installed; and configured to surround an electromechanical window shade. In this implementation, the electromechanical window shade can be installed on the ceiling structure  192  and adjacent the window and can sit in an apex between the ceiling structure  192  and a short wall structure  194  above the window. The linear wall track  170  can be installed on the ceiling structure  192  along the electromechanical window shade opposite the window. The first or second receiver  120 ,  130  of the ceiling tile  110  can be installed on the linear wall track  170  and can conceal the electromechanical window shade when retracted, but the shade recess  119  enables the shade to drop to shade the adjacent window. 
     The ceiling facade system  100  can similarly include a ceiling tile  110 : designated for installation adjacent a window or between two interior spaces; and including a recess configured to receive a curtain configured to move laterally along a ceiling-mounted or tile-mounted curtain track to cover the adjacent window or to separate the two interior spaces. 
     As a person skilled in the art will recognize from the previous detailed description and from the figures and claims, modifications and changes can be made to the embodiments of the invention without departing from the scope of this invention as defined in the following claims.