What do you see - or think you see? Are you sure? You could be wrong, because all these brilliantly beautiful and surprising images are out to fool your eye! Every optical illusion is a wonder. For example: Even though a shape has only 2 or 3 colours, the background can trick you into thinking you are looking at a rainbow of tints and shades. The same grid of squares can appear completely different depending on whether they have an outline or not. Pictures fade from view when you close one eye and stare at points of colour for a few seconds; Watch the grinning Cheshire Cat disappear when you focus your attention on a spot in the centre. Can you tell which of the two houses (one red, one blue) is nearer? Figure out if the animal shape is a pink flamingo or an Indian elephant. Try to read "alien" writing; Observe mystic spirals; Serious market: art and graphic design students specialising in colour and its applications. Fun market: puzzlers and games enthusiasts of all ages.