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

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

Where does this staircase begin? Where does it end?

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

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

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

get to disappear?

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

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.

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