The Floating Disc
A picture in which nothing moves, and something will not keep still.
How to play
Nothing on the next screen moves
Let your eyes wander across the picture, or move your head a little closer and further away.
- Under a minute · one question · then the explanation
- This one moves, or may seem to.
How it works — best read after you have tried it
Motion from stillness
Your eyes are never perfectly still. Each small movement shifts the two stripe patterns differently: along the stripes nothing changes, across them everything does.
The disc and the field disagree about how far the image moved, and your brain settles the argument by deciding the disc is floating.