Door/Viewer is a functional security gate and ramp rail system at a housing development in San Mateo, California. The piece includes 110 individual viewer boxes inspired by the security viewer common in front doors all over the world. In Door/Viewer, the viewers are in three sizes, from small, actual door viewers, through large pieces of dichroic glass, which refract light into different colors, depending on the angle of view.

Commissioned by Wood Partners for the 1% for the arts ordinance of San Mateo, Door/Viewer is an example of public art that also serves a vital community function.