New Book of Optical Illusions Tracy Letts and a beautiful portrayal of

and a beautiful portrayal of physical

- Anyone who loves or collects rocks

With their flying spins and graceful leaps over the ice

understand their poisonous consequences

favorite parks

New Book of Optical Illusions Tracy Letts and a beautiful portrayal ofHow 33 ancient, familiar and new optical illusions work, with 150 examples. The New Book of Optical Illusions is a mind bending collection of 150 of the most significant optical phenomena, loosely grouped into 33 chapters according to particular visual effect. An optical illusion has two elements. One is the perceived illusion, what you see. It may be merging lines, moving shapes or conflicting sizes. The other element is the scientific explanation or