Abstract: In one aspect, an input system includes a light source, a first optical sensor, a second optical sensor, and a processing system. The light source illuminates a first scene that changes in response to a first type of user input and a second scene that changes in response to a second type of user input. The first optical sensor has a first field of view of the first scene and produces first electrical signals in response to light from the light source in the first field of view. The second optical sensor has a second field of view of the second scene and produces second electrical signals in response to light from the light source in the second field of view. The processing system respectively produces first and second user interface control signals from the first and second electrical signals.