Two Optical Illusion Books in shrink wrap still, First one is Optical Illusion Tricks & Toys by E. Richard Churchill (see below)

"Page after page of tricks and toys that fool the eye, complete with easy instructions, illustrations, and explanations."--Parenting. "A book that is sure to provide readers with many hours of fun."--SLJ. "An unusual rainy day resource."--Booklist. 128 pages, 5 3/8 x 8 1/4.
Product Details

* Reading level: Ages 9-12
* Paperback: 128 pages
* Publisher: Sterling; Revised edition (June 30, 1990)
* Language: English
* ISBN-10: 0806968699
* ISBN-13: 978-0806968698

Second book The World's Best Optical Illusions by Charles H. Paraquin

Here are pictures that seem to move, images that mysteriously disappear and reappear, others that seem to be there but aren't--plus over 100 more amazing illusions. "Entertaining collection...I applaud the number and variety of images presented."--Science Books & Films, Best Children's Science Booklist, 1988.
# Reading level: Ages 9-12
# Paperback: 96 pages
# Publisher: Sterling (July 1, 1987)