Troop ships crossing the oceans during World War I were under constant threat of attack by German submarines. To combat this threat, dazzle camouflage was applied to sea-going vessels. Utilizing complex geometric patterns and contrasting colors, the goal was not to conceal a ship, but to make it more difficult to estimate the ship’s size, speed and position in the water. No two dazzle paint schemes were the same and could be particularly deceptive when seen through a submarine periscope. (U.S. Air Force photo)