The animal kingdom provides examples of all the essential principles of camouflage: the chameleon, whose colors change to merge with its setting; the zebra, whose vivid stripes disrupt its outline and make it more difficult for predators to sight from a distance; the stick insect that pretends to be what it's not.
Creativity in the art of disguise was spurred in World War I by the threats of aerial reconnaissance and long-range enemy fire...