Camouflaging has always been a part of warfare, but it was only during the two world wars that things got really creative.
During the First World War, both sides kept constant watch of the enemy lines for movement, but that was not an easy task. Anyone who stuck his head above the trench parapet for more than a few seconds was shot. So the French started disguising observation posts as trees. Then they taught the British how to do it. Later, the Germans started using them too.
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Source: amusingplanet.com