Download or read book Puzzling Optical Illusions written by Thomas Crawford and published by Courier Corporation. This book was released on 1998-02-06 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: A rich assortment of visual mind-bogglers, including "impossible objects" — constructions that look fine on paper but can't possibly exist in reality — as well as pulsating patterns, vanishing spots, pictures that suddenly change into other configurations as you're looking at them, and much more. 60 black-and-white illustrations.