Michael Bach Illusions

Michael Bach's collection pairs a remarkably deep catalog of perception tricks with the scientific thinking behind them. You can browse 156 entries across motion, color, depth, faces, sound, and more, then linger over the demonstrations that make your eyes argue with the evidence.

What is Michael Bach Illusions?

This is less a quick list of gotchas than a long-running field guide to the ways perception edits reality. The catalog ranges from familiar grids and afterimages to obscure motion, brightness, binocular, and auditory effects. Individual pages typically frame the phenomenon, tell you what to look for, and unpack a likely mechanism with references where useful. The result has the friendly clutter of a personal laboratory notebook: dense in places, but unusually generous about explaining why the trick works instead of merely springing it on you.

What you can do there

• Browse visual and auditory phenomena by category
• Adjust supported demonstrations
• Read perception-science explanations

Why we picked it

The collection earns its place by keeping wonder and rigor in the same room. Its breadth makes aimless browsing rewarding, while the explanations turn each moment of visual betrayal into a small lesson about how efficiently the brain normally works. The dated history also shows a project that has been tended for decades rather than abandoned after one viral illusion.

How to get the most from it

Start with a section that matches your curiosity, open one entry, and read its viewing instructions before changing any controls. If an effect refuses to appear, move on without treating it as a test; the site itself notes that normal viewers do not perceive every illusion. Keep JavaScript enabled for the interactive demonstrations and use the previous and next controls when you want a guided wander.

Good to know

The site is free, accepts donations, offers English and German versions, and does not require an individual login. Some explanations assume real comfort with vision science, though the pictures remain enjoyable without mastering every mechanism. Watch the flicker labels if you are sensitive to flashing or rapid motion. The legal notice discloses server logging and Google Analytics, and interactive behavior was not tested in a rendered session for this review.

Who made it, and when?

Michael Bach is the credited creator or organization. The earliest supported launch date we found is April 13, 1997. A documented update was recorded August 7, 2026.