Optical Illusion Play Pack Author:Martin Gardner These optical illusions have more magic than any others! That?s because this fun and visually enticing pack gives kids something special: The opportunity to play with the images, not just look at them. It?s created by the much-respected and prolific author Martin Gardner, who wrote the ?Mathematical Games? column in Scientific A... more »merican for more than a quarter of a century. Gardner?s numerous puzzle collections, as well as his expert writing on math and science, have made him a force to be reckoned with in the field. Packaged right inside the book are lots of punch-out cards that will enhance every illusion?plus a vinyl pouch for safely storing the cards afterwards. So when children try to figure out if the two differently shaped tables in a picture are actually the same size, they can see whether they?re right by laying a ?checkered tablecloth? over them both. Or they can pin a colorful rainbow disk to the page, spin it, and watch the colors ?disappear.? Each illusion gets an entire spread, with instructions, extra illustrations, and sometimes sidebars, too.« less