{"title":"Supervisions Ser","description":null,"products":[{"product_id":"super-visions-ambiguous-optical-ill-book-al-seckel-9781402718298","title":"SUPER VISIONS AMBIGUOUS OPTICAL ILL","description":"First you see one thing, then another. The picture changes from one moment to the next, flip-flopping back and forth. 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That's what these 90 action illusions - the largest such compilation ever assembled - succeed in doing. Through the magic of visual effects, including the careful use of colour and brightness, static images become animated and solid shapes deform right before your eyes. Some of the illusions appear to hover in the air; others produce afterimages of bright colour or produce a sensation of swirling. In a number of cases, it's necessary to shift the entire page to get the trick, or to use peripheral vision for the full effect. 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When you look at these images - some classic, others never-before published - you'll have a hard time believing what the captions say about their size, shape, or other geometric aspect. For example, two tables appear radically different to the naked eye - but they're actually identical in size and shape. It's all a matter of perspective and perception. 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