Chameleon turquoise, and purple. Chameleon skin has a superficial layer which contains pigments, and under the layer are cells with guanine crystals. Chameleons change colour by changing the space between the guanine crystals, which changes the wavelength of light reflected off the crystals which changes the colour of the skin. Colour change in chameleons has functions in camouflage, but most commonly in social signaling and in reactions to temperature and other conditions. The relative importance of these functions varies with the circumstances, as well as the species. Colour change signals a chameleon's physiological condition and intentions to other chameleons. Chameleons tend
Lozenge camouflage Lozenge camouflage Lozenge camouflage was a military camouflage scheme in the form of patterned cloth or painted designs used by some aircraft of the Central Powers in the last two years of , primarily those of the Imperial German "Luftstreitkräfte". It takes its name from the repeated polygon shapes incorporated in the designs, many of which resembled lozenges. In Germany it was called "Buntfarbenaufdruck" (multi-colored print) but this designation includes other camouflage designs such as "Splittermuster" and "Leibermuster", and does not include hand-painted camouflage. During the early stages of the Great War, the Germans were looking for a way to