Incredible Visual illusions is the most comprehensive and amazing collection of optical illusions ever assembled, with close to three hundred different illusions, many of which have never before been published. You will be amazed as images flash and scintillate before your eyes, other images disappear right in front of you, size and shape lose their meaning, you see motion where there is no motion and the laws of perspective are turned on their heads! This stunning collection has been created by cognitive vision scientist Al Seckel, of the California Institute of Technology, a leading authority on visual illusions. Al has lectured extensively on the subject of illusions at many of the world's most prestigious universities, and he also designs and builds interactive galleries of illusions for science museums around the world. Al Seckel is also the President of IllusionWorks, which licenses illusion images and products internationally.