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Topsys & Turvys

	The first print of this book was more than 100 years ago, and it's still being sold. That should mean something. If you're really into upside-downs, I can recommend this. One every page is a topsy-turvy like the ones you can see on this site.
	by: Peter Newell
	ISBN: 0804815518
	View on Amazon.com

Planet Perplex is a comprehensive collection of optical illusions, impossible objects, hidden images, puzzles and related images.
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Last modified on Saturday, May 3 2008