Visual Illusion Cards<div style="text-align: left;"><strong>[Product Information]</strong><ul><li id="replacementPartsFitmentBullet" class="aok-hidden" data-doesntfitmessage="We're not sure this item fits your " data-fitsmessage="This fits your "><span class="a-list-item"><span id="replacementPartsFitmentBulletInner"><a href="#" class="a-link-normal hsx-rpp-fitment-focus">Enter your model number</a>to make sure this fits.</span></span></li><li><span class="a-list-item"> Contains 52 different visual illusions and instructions </span></li><li><span class="a-list-item"> Prepared by professors of psychology in the Gestalt tradition </span></li><li><span class="a-list-item"> Card size 3-1/2" L x 2-1/2" W </span></li><li><span class="a-list-item"> illusions in color， color reversal and ambiguous figures </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/61NgDET7hzL.jpg" noproxy>