If you are a fan of optical illusions and you like physical calendars for your desk, make sure to check out Ultimate Optical Illusions:  Visual Tricks to Challenge the Eye and Mind, a new 2015 Day-to-Day calendar.  This full-color calendar published by Andrews McMeel Publishing has a new illusion for each day of the week […]

Two red hearts are presented below on a blue background.  One of the hearts is “blurry” and the other is not.  As you move your eyes back and forth between them, the blurry heart appears to wobble (as if it were unstable) while the solid red heart does not. This illusion was presented by Kohske […]