Under the Lens

The picture was there all along

Nothing under the lens was added. The wall and the lens are the same tiles in the same places, the same sites on each; the only difference is how far apart the light tiles and the dark ones are. On the wall the gap is small, so the letters and colours on each tile, which change far more from one tile to the next, drown it out.

Turn the difference up and it rises above that noise, and a shape appears that was always encoded in the wall. A lens that shows only a small circle at a time also makes you build the picture in your head, piece by piece, which is harder than it sounds and part of the game.