Optical illusions you can try right now
A picture of an illusion in an article is a poor substitute for the thing itself. Most of these depend on motion, on staring for twenty seconds, or on moving your own eyes — none of which survives being screenshotted into a listicle.
These are the interactive ones. Each is a single page that does one trick, properly.
- 1
Lilac Chaseroptical.toys
The lilac chaser. Fixate on the centre and the gaps start generating a colour that is not on the screen.
Open it here → - 2
Waterfall Effectoptical.toys
The waterfall effect — stare, look away, and the whole world drifts upward for a few seconds.
Open it here → - 3
Concentric Spiralsoptical.toys
Spirals that are provably concentric circles. Trace one with your finger and it still refuses to look like a circle.
Open it here → - 4
Zollner Illusionoptical.toys
The Zöllner illusion. Parallel lines that tilt because of the short strokes crossing them.
Open it here → - 5
Thatcher Effectoptical.toys
The Thatcher effect, which stops working the instant you turn the image the right way up.
Open it here → - 6
Schroders Stairsoptical.toys
Schröder’s stairs, flipping between two readings while you watch.
Open it here → - 7
Spinning Duckoptical.toys
A silhouette with no depth cues at all, so your brain simply picks a direction.
Open it here → - 8
Shepard Toneoptical.toys
The audio one. A tone that climbs forever, which is what happens when you loop octaves properly.
Open it here →
The reason these hold up is that they are not tricks in the stage sense. Each exploits a specific shortcut your visual or auditory system takes, and the shortcut is not optional — which is why knowing the explanation does not stop the effect.
Questions
Do optical illusions still work if you know how they work?
Yes, and that is the interesting part. These exploit low-level processing in the visual system that operates below conscious control, so understanding the mechanism has no effect on the experience. The lilac chaser produces green whether or not you know why.
Every site above was loaded in a real browser and verified working before this was published. See the full catalogue.