How To Hide An Airplane Factory

During World War II the Army Corps of Engineers needed to hide the Lockheed
Burbank Aircraft Plant to protect it from a Japanese air attack. They
covered it with camouflage netting and trompe l'oeil to make it look like a
rural subdivision from the air.

http://thinkorthwim.com/2007/08/19/1034/

h/t anewdawn