A user interface system, comprising: • a layer portion defining a surface and a particular region; • a substrate coupled to the layer portion opposite the surface, cooperating with the layer portion to define a cavity at the particular region, and comprising a fluid channel coupled to the cavity; • a volume of fluid contained within the cavity; • a displacement device coupled to the fluid channel and configured to displace fluid into the cavity to transition the particular region from the retracted volume setting into an expanded volume setting causing outward deformation of the particular region; and • a sensor comprising a first conductor coupled to the substrate and a second conductor coupled to the layer portion at the particular region; and • a processor coupled to the sensor and configured to detect an input on the surface at the particular region in the expanded volume setting in response to a detected change in a distance between the first conductor and the second conductor, characterized in that the substrate further defines a support member extending into the cavity, the support member configured as follows: disconnected from the layer portion in the particular region; in contact with the particular region of the layer in a retracted volume setting; and supporting the particular region of the layer against inward deformation in to the cavity in the retracted volume setting, wherein the surface at the particular region configured to be flush or continuous with the surface at an adjacent region in the retracted volume setting such that when swiping a finger across the surface 115 a user would not feel any interruptions or seams. • a layer portion defining a surface and a particular region; • a substrate coupled to the layer portion opposite the surface, cooperating with the layer portion to define a cavity at the particular region, and comprising a fluid channel coupled to the cavity; • a volume of fluid contained within the cavity; • a displacement device coupled to the fluid channel and configured to displace fluid into the cavity to transition the particular region from the retracted volume setting into an expanded volume setting causing outward deformation of the particular region; and • a sensor comprising a first conductor coupled to the substrate and a second conductor coupled to the layer portion at the particular region; and • a processor coupled to the sensor and configured to detect an input on the surface at the particular region in the expanded volume setting in response to a detected change in a distance between the first conductor and the second conductor, characterized in that the substrate further defines a support member extending into the cavity, the support member configured as follows: disconnected from the layer portion in the particular region; in contact with the particular region of the layer in a retracted volume setting; and supporting the particular region of the layer against inward deformation in to the cavity in the retracted volume setting, wherein the surface at the particular region configured to be flush or continuous with the surface at an adjacent region in the retracted volume setting such that when swiping a finger across the surface 115 a user would not feel any interruptions or seams. disconnected from the layer portion in the particular region; in contact with the particular region of the layer in a retracted volume setting; and supporting the particular region of the layer against inward deformation in to the cavity in the retracted volume setting, wherein the surface at the particular region configured to be flush or continuous with the surface at an adjacent region in the retracted volume setting such that when swiping a finger across the surface 115 a user would not feel any interruptions or seams.