Recently, a colleague of mine moved to a new office and he used the chance to put some posters on his wall. One was a photo mosaic he made back when the first of the new Star Wars movies (the one with Qui-Gon Jinn) came out. Based on a few hundred scaled-down images, those images where chosen and arranged in a grid to for a larger image from the same movie. Large image could be identified from a distance, but if you would step closer, you could clearly see each small image.