Seagull Photographic Mosaic
A photographic mosaic uses a series of smaller photographs to create a larger recognizable image. The example below uses hexagon-shaped photographs of birds and other nature-related imagery. When put together in a special way (with the help of a software program), they form a larger image of a seagull. The seagull can be seen more clearly by either squinting your eyes or standing further away from your screen.
Image found on Wikipedia.