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Puzzle Cards no pen 50 Optical Illusions - Sam Taplin; Sam Taplin; Hanri van Wyk; Matthew Durber; Various (Cards) 30-10-2009

Puzzle Cards no pen 50 Optical Illusions - Sam Taplin; Sam Taplin; Hanri van Wyk; Matthew Durber; Various (Cards) 30-10-2009

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A set of 50 of the most amazing optical illusions ever created. Each card has a mind-boggling illusion on one side and an explanation of how it works on the other. Includes a "revealer" card to help check colours and take measurements to show that seeing really is believing.