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Gianni Sarcone and Marie-Jo Waeber are co-founders of Archimedes' Laboratory, an Italian-based training and consulting network of game designers that specializes in developing creativity. They invent, create and develop interactive thinking games and optical illusions. They wrote New Optical Illusions, Eye Tricks, Make Your Own 3D Illusions and Puzzillusions.

Ambiguous Figures: Images that appear to be two or more different objects or people.; Impossible Figures: People, places or objects that simply cannot exist!; Hidden Figures: Looking carefully for a length of time causes new objects to appear.; Colour Adaptation Illusions: Studying one image before looking at another causes odd things to happen to colour perception. These images demonstrate various amazing effects.; Length Misperception: How long? Which line? How far away? Answers rarely match up with their expected solutions with these images.; Illusory Moving Patterns: These pictures can't possibly be moving but when you stare at them they look like they do!; Paradoxical Illusions: A selection of curious perception puzzles.