These are simple visual illusions. You may have seen some of them before. Click on the picture or the link below it to view the illusion.
These contours don't exist.
Some Gestalt groupings.
Moiré patterns are produced when two geometrically periodic patterns are superimposed. These animated moiré patterns illustrate the phenomenon.
These rotating patterns yield an appearance of depth — this has been called the stereokinetic effect.
These are op-tical illusions.
This is the Op Art section.
