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Weird
Illusion collections and perception demos. The good ones keep working after you have been told exactly how they work.
13 sites
The lab page of the psychologist whose completely static images refuse to stop rotating, added to for over twenty years.
Gianni Sarcone's workshop of puzzles and illusions, half optical trickery and half mathematical recreation, running since the 1990s.
Annual contest in which vision scientists compete to fool you, with every finalist since 2005 still watchable.
Plain, well-sorted illusion collection with the explanation directly underneath each one, from café walls to impossible triangles.
Interactive classroom illusions you can drag, toggle and pause, which makes the effects considerably harder to dismiss.
Tim Rowett's collection of optical toys and physics oddities, each demonstrated on camera by a man visibly delighted with all of it.
A philosophy department's catalogue of illusions, each with what it is, what it demonstrates, and the argument still going about it.
Catalogue of impossible figures, ambiguous objects and Escher-adjacent architecture, kept up by one very devoted collector.
The official Escher archive: the impossible staircases, the tessellations, and his own notes on how he worked them out.
Official home of the autostereograms from every 1990s shopping centre, with a fresh one each week to go cross-eyed at.
Around 140 visual phenomena, each with sliders to break the effect and a vision scientist's explanation of why you fell for it.
Long-running blog of illusions and visual puzzles, from classic ambiguous figures to whichever dress the internet is arguing about.
Steady feed of new illusions with the comments doing the debunking, which is usually half of the entertainment.
One button, one detour. Press it as often as you like.