Optical illusion maker
Pick an illusion. Drag the sliders. Watch the numbers change beside the image.
Measured from the image
Sliders
How the maker works
Each illusion is drawn pixel by pixel in your browser. The panel next to the image lists values read from those pixels, such as line angles, bar lengths or the RGB values of two patches. The sliders use the ranges the renderer documents. Nothing leaves your device.
Want the story behind an illusion? Each one has its own page.
Want hidden 3D pictures instead? Try the magic eye generator.