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Armchair Puzzlers: Optical Teasers: Sink Back and Solve Away! (Armchair Puzzlers)
Armchair Puzzlers Optical Teasers Sink Back and Solve Away - Armchair Puzzlers Author:Al Seckel Each optical teaser in this challenging book is a small diagram that, when stared at or moved in a certain way, tricks the eyes. Brief directions show readers how to experience the teaser. Some of these "directions" ask a question intended to make the viewer do something. The answer to the question is determined by viewing the teaser and is also... more » printed in upside-down text at the bottom of the page. The teasers are very easy to perform but are interesting enough to merit repeated viewings. Includes over 80 puzzles.« less