There is nothing moving on the picture. (© Akiyoshi Kitaoka: Used with permission.)

Another static picture. (© Akiyoshi Kitaoka: Used with permission.)

Motion is just an eye illusion. (© Akiyoshi Kitaoka: Used with permission.)

There is nothing moving below. (© Akiyoshi Kitaoka: Used with permission.)

Boats on the picture are not moving. It's just an eye illusion. (© Akiyoshi Kitaoka: Used with permission.)

Who do you like more - women or saxophone players?

Are there really just flowers?

Is this really a spiral?

Are the horizontal lines parallel? (of course they are)

If you can read the following picture, then you can shout ...

You may read across and upright.
A-B-C or 12-13-14?

This impossible object is called "Devil's Fork" or "Schuster's Conundrum" (by D. H. Schuster)

Given the wood do you think you could make this?

Or this one?

A realistic photo?

Try to arrange dice like this.

Another interesting building.