And yet it doesn't move

Eppur si muove.

This is the phrase that Galileo Galilei pronounced after being forced to recant his belief on heliocentric theory by the Inquisition Tribunal (and most probably after leaving the courtroom...).

In this case, we must say just the opposite.

Staring at the image, we get the impression that all the squares are moving side to side.

But, it's a fixed image!

Color illusion

Some people think everything's dark. Some people think everything's clear. Some believe that everything is black or white, and some think that there are infinite shades of gray.

In any case, one thing is what we see and other one is that what we think we seer.

Let's look at this example, and try to figure out which box is clearer, A or B.

To see the solution, let's have a look at:

Color illusion