50 Optical IllusionsBy: Sam Taplin Illustrator: Hanri van Wyk,Matt Durber,Various Series: Puzzle Cards no pen 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.
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