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and build upon.” Besides chameleons,many other creatures have developed the ability to change color.The color in these creatures is based on tiny particles (in a repeating pattern,known as photon- ic crystals.The pattern of these particles causes the material to interact with wavelengths of light.Although the particles them- selves are colorless,the precise spacing between them allows certain light waves to pass through them while rejecting others. The visible colors produced change depending on factors such as lighting conditions or shifts in the distance between the particles. To create an artificial smart skin,scientists have experimen ted with inserting photonic crystals into flexible,water-contai- ning hydrogels(水擬胶).Changing the hydrogels in size results