{"product_id":"optical-illusion-play-pack-book-martin-gardner-9781402733383","title":"Optical Illusion Play Pack","description":"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 American\" for more than a quarter of a century. Gardner's numerous puzzle collections, as well as his expert writing on maths 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 colourful rainbow disk to the page, spin it, and watch the colours \"disappear.\" Each illusion gets an entire spread, with instructions, extra illustrations and sometimes sidebars, too.","brand":"WoB","offers":[{"title":"GB \/ VERY_GOOD \/ INTERNAL","offer_id":49566268391697,"sku":"GOR007479875","price":10.0,"currency_code":"USD","in_stock":true},{"title":"US \/ GOOD \/ SBYB","offer_id":49799044104465,"sku":"CIN1402733380G","price":6.55,"currency_code":"USD","in_stock":false},{"title":"US \/ VERY_GOOD \/ SBYB","offer_id":50572355666193,"sku":"CIN1402733380VG","price":5.25,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0784\/4072\/6801\/files\/1402733380.jpg?v=1751403532","url":"https:\/\/www.worldofbooks.com\/products\/optical-illusion-play-pack-book-martin-gardner-9781402733383","provider":"World of Books ","version":"1.0","type":"link"}