This tablecloth pattern is quite lively, the dots are dancing. But concentrate on a single intersection of two lines: The dark point disappears.

Optical illusions

Unfortunately there is no Flash available

There it jerks and chops it in Oberstübchen. Which box do you think moves faster? Not so easy to say? Then wait until the black bars disappear in our animation.

Optical illusions

Unfortunately there is no Flash available

Use the middle arrow to mark half of the line, you can just move it around. If you have located the ruler correctly, see if you have located it correctly.

Optical illusions

Unfortunately there is no Flash available

What a geezer! In fact, all lines are straight. The movement confuses our brains and turns the picture into an optical illusion.

Optical illusions

Unfortunately there is no Flash available

Quite crazy! To see an effect here, you would actually have to move your head to the screen every now and then. But even if you click on the picture, you'll realize what's in it.

Optical illusions

Unfortunately there is no Flash available

These squares are as crooked as bananas. There is no doubt about that. If you are so sure, click on the surface!

Optical illusions

Unfortunately there is no Flash available

Another banana candidate. But here, too, the eye tricked us, as you will see when you click on the picture. The lines in the background make the brain make wrong conclusions.

Optical illusions

Unfortunately there is no Flash available

Certainly, you will also claim style and self-confidence: the color on the right is darker. Then click away the black bars ...

Optical illusions

Unfortunately there is no Flash available

These two Maggie Thatchers are upside down. Nothing special? Then click on the pictures.

Optical illusions

Unfortunately there is no Flash available

This ring is a round thing and gray in gray yet. Do you know what happens if you share it with a click?

Optical illusions

What we can still rely on, you ask yourself slowly? Then concentrate for about half a minute on the four dots in the middle of this picture. Then close your eyes and put your head back. If you keep your eyes closed, you will see after a while - what?

Optical illusions

As a consolation: The wheels in your brain gear are working perfectly. Everyone has the feeling in this actually static image to go crazy.

So trusting our eyes can go wrong. How is Saint-Exupéry quoted in every two and a half poetry albums in the world? "One only sees well with the heart, the essential is invisible to the eyes."

Facts and fiction about truth and deception | Charles Honts | TEDxBoise (March 2023).