Moving images are everywhere these days, and increasingly on the surfaces of our buildings. “It is not hard to envision a day when we will live in chameleon cities, when the radiant skin of all new buildings will be programmed to produce an ever-changing array of colors, messages and shows. The movie in the church courtyard involved the transformation of a plain white wall; architects these days are integrating the evanescent image directly into their designs, using video the way their predecessors used cast iron and stone.”