Right - this one is taking advantage of your brain trying to fill in the gaps and create something that isn't there. Clearly when you look at both of these images the left hand image is clear and the right is blurry. But this trick will make you see detail (moving detail) in the right hand image when none exists.Instructions:
Click to enlarge.
Stare at the centre of the left hand box for 30 seconds
Then stare at the centre of the right hand box and watch!Click on the image to enlarge it to FULL SIZE