In 1942, after the United States entered the second world war and fearing the Japanese threat on the Pacific coast, an entire aircraft plant and airport -the Lockheed Burbank- has been camouflaged to escape from sight to potential Japanese airplanes. It is interesting to observe that, in order to do so, the US army had to ask for the help of Hollywood studios -WWII is probably the beginning of a long history of exchanges between Hollywood and the US Army- to make this industrial landscape appearing as a piece of suburbia. The very vast aircraft plant was therefore obliged to function under a porous canopy from which was emerging here and there, some chimneys disguised in trees or fountains.

Thanks Martial. (see more on amusingplanet)