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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. 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.
Gianni Sarcone and Marie-Jo Waeber are co-founders of the award-winning Archimedes' Laboratory, an Italian-based network of game designers that specialize in developing creativity. They invent, create and develop interactive thinking games and optical illusions. Sarcone and Waeber are also regular authors of columns for newspapers and magazines featuring visual puzzles and brainteasers.