Optical Illusions

Optical Illusions puts 152 classic and surprising illusions on your phone, sorted into 13 groups. Look, guess, then tap "Show the answer" to find out how your eyes and brain were fooled. Everything is stored in the app, so it works without a connection.

What's inside

• 152 illusions in 13 groups: Two Pictures in One, Impossible Objects, Size and Length, Lines and Shapes, Light and Colour, Motion, Afterimages, Hidden Pictures, Faces in Things, Depth and Perspective, Painted Tricks, Mirrors and Trick Photos, and Brain Teasers

• Over 100 puzzles that ask first: Which line is longer? Which square is darker? Could you build this? The answer waits behind a button

• 16 animations, from the Spinning Dancer to a wagon wheel that seems to turn backwards

• Classics like the Penrose triangle, the café wall, the checker shadow, the Necker cube and the Müller-Lyer lines, alongside tricks by painters such as Arcimboldo, Holbein and Bruegel

• Tap any picture to see it full screen and zoom in

• Swipe sideways from one illusion to the next

Pictures

The pictures come from Wikimedia Commons, and each one shows its author and licence in the app; a few animations were made for this app. All picture credits, with links:

https://susasoftx.github.io/illusions-credits.html

The app shows a small banner ad. Privacy policy: https://susasoftx.github.io/privacy-policy.html