Ambitious 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; Length Misperception: How long? Which line? How far away?; Illusory Moving Patterns: You know these pictures aren't moving but it looks like they do!; Paradoxical Illusions: curious perception puzzles.