An interactive display device, comprising: an elastomer layer ; a reflective layer configured to transmit light having a first characteristic and to reflect light having a second characteristic and configured to deform by a force applied to it; a display positioned to output modulated light having the first characteristic through the elastomer layer and the reflective layer as a display image; a test light source positioned to output light having the second characteristic through the elastomer layer for reflection off of the reflective layer ; a sensor configured to receive light having the second characteristic reflected from the reflective layer ; a logic subsystem configured to execute instructions; and a data-holding subsystem holding instructions executable by the logic subsystem to interpret a pattern of light having the second characteristic received by the sensor as a touch input deforming the reflective layer , wherein the system is configured that light having the second characteristic reflected from one or more regions of the reflective layer deformed by the touch input or inputs is directed to the sensor , whereas light having the second characteristic reflected from one or more regions of the reflective layer not deformed by the touch input or inputs is directed to a location proximal to the sensor , or wherein the system is configured that light having the second characteristic reflected from one or more regions of the reflective layer deformed by the touch input or inputs is scattered from the sensor , whereas light having the second characteristic reflected from one or more regions of the reflective layer not deformed by the touch input is directed to the sensor . an elastomer layer ; a reflective layer configured to transmit light having a first characteristic and to reflect light having a second characteristic and configured to deform by a force applied to it; a display positioned to output modulated light having the first characteristic through the elastomer layer and the reflective layer as a display image; a test light source positioned to output light having the second characteristic through the elastomer layer for reflection off of the reflective layer ; a sensor configured to receive light having the second characteristic reflected from the reflective layer ; a logic subsystem configured to execute instructions; and a data-holding subsystem holding instructions executable by the logic subsystem to interpret a pattern of light having the second characteristic received by the sensor as a touch input deforming the reflective layer , wherein the system is configured that light having the second characteristic reflected from one or more regions of the reflective layer deformed by the touch input or inputs is directed to the sensor , whereas light having the second characteristic reflected from one or more regions of the reflective layer not deformed by the touch input or inputs is directed to a location proximal to the sensor , or wherein the system is configured that light having the second characteristic reflected from one or more regions of the reflective layer deformed by the touch input or inputs is scattered from the sensor , whereas light having the second characteristic reflected from one or more regions of the reflective layer not deformed by the touch input is directed to the sensor . <EOS>