* Double trouble: images that appear to be two or more different objects or people * Impossible People: illusions involving people and faces * Artful animals: illusions involving animal images. Camouflage, hidden animals etc * Colours and Shapes: Colour adaptation illusions - studying one image before looking at another causes odd things to happen to colour perception * Twisted!: Shape puzzles. Line puzzles. Straight or curvy? How long? Which line? How far away? * Moving patterns: illusory moving patterns: You know these pictures aren't moving - but somehow it looks as if they are! * Visual Paradoxes: Paradoxical illusions: curious perception puzzles * Impossible Images: Escher prints and other images of buildings and shapes that would be impossible in three dimensions * Seeing Double: Classic images with two interpretations - old woman or young woman? Face or basket of fruit * Afterimages: Stare at the discoloured image for 30 seconds, close your eyes, and a photo-quality face appears on your eyelids * Twisted!: Shape puzzles. Line puzzles. Straight or curvy? How long? Which line? How far away? * Psychedelic Twisters: Bright swirls and jags of colour that look as if they're moving when they aren't * Forced Perspective: Do Try This at Home!: Examples and ideas for creating your own optical illusions by setting up photos which show you, for example, holding a plane between your fingers as it flies through the sky. isted!: Shape puzzles. Line puzzles.

Straight or curvy? How long? Which line? How far away? * Psychedelic Twisters: Bright swirls and jags of colour that look as if they're moving when they aren't * Forced Perspective: Do Try This at Home!: Examples and ideas for creating your own optical illusions by setting up photos which show you, for example, holding a plane between your fingers as it flies through the sky.ok as if they're moving when they aren't * Forced Perspective: Do Try This at Home!: Examples and ideas for creating your own optical illusions by setting up photos which show you, for example, holding a plane between your fingers as it flies through the sky.