Another pixelized face. Can you guess who it is?

* Close your left eye and stare at the cross. As the circle moves left and right, it should pass through your blind spot and disappear completely! You may need to lean in closer to get this to work.

Move your head around this image. The blue and green color fields will appear to move and change size.

Stare at the lobster's eyes long enough, and the dish will seem to repair itself.

* Although this image is not animated, the tessellated tiles will appear to spin if you stare at them long enough.

Stare at the moon long enough, and the stars should begin to fade away. How many can you get to disappear?

How many pencils can you see here? What's going on?

Count how many colors you see here. Most people see four: green, blue, and two shades of a pinkish color.

Can you guess the identity of the faces here? The human brain is remarkable at recognizing extremely low-resolution images.

Can you tell which of these lines is longer? Test them with a ruler or a piece of paper -- you may be surprised.

Stare at the red dot long enough, and the grey stripes will disappear.

The blue ovals seem to move, but this is a still image.

* As the small circles intersect with the large ones, we seem to see the outlines of a growing and shrinking square. But there is no "square" -- your brain is trying to visualize in terms of solid shapes, and fills in the blanks.