Classic optical illusions

Optical illusions are entertained us for hundreds of years.

There are many optical illusions, which are distributed on the Internet and put in a blind alley, but there are also classic that still mislead people.

From the famous artist MC Escher Magic Eye posters up, here are some of the most famous optical illusions.

The optical illusion is difficult to understand - they include a lot of science and a thorough understanding of how the eyes and brain work together to perceive the world around us. And some, like the illusion Jastrow, still put the audience into a dead end.

The Incredible trident was first published in 1964 by DH Schuster

Classic optical illusions

It is also known as the inability to fork, fork or Devil blyuvit.

Impossible plug is exactly what is impossible. When viewed from below, it seems to have three teeth, but on top of it is clearly divided into two parts only.

These points seem to move because of the phenomenon called illusory motion

Classic optical illusions

If you concentrate on one particular side of the graph, the point will stop moving.

Illusory movement - is the emergence of the movement in a static image.

A study led by researchers at the Barrow Neurological Institute explained that the tiny eye movements and blinking - the reason for the apparent movement.

This illusion is known as "Café Wall illusion" because it was first observed in the cafe

Classic optical illusions

The illusion was first published in 1979.

Richard Gregory discovered this illusion in a cafe in the 1970's. Gray lines appear slanted, but if you close the black and white tiles, you will see that the line is actually straight. To this illusion to work properly, the tiles have to be shifted by half a tile and gray lines should be in place.

The effect works through the interaction of neurons in the brain. Your retina fade and lighten various parts of the gray lines because of the location of the tiles. When between two tiles have a contrast of brightness (eg, the black tiles on top of the white tiles), your neurons interpret these changes as small wedges - creating oblique lines.

The dark point that there is no

Classic optical illusions

is known as the German grid.

This illusion goes back to the 1870s, when it opened Lyudimar Herman.

These points are the result of neuronal processes, called lateral inhibition - the ability of neuronal excitation to reduce the activity of its neighbors. When a lot of light falls on the retina neuron (eg, white stripes), neurons can not handle it all, so there are black dots.

This is the elephant in the middle of "Ängsö National Park-Istensial Kanderi"

Classic optical illusions

Can you say how many legs this elephant?

It is easy to solve this problem - to cover his feet. Then you can clearly see that the elephant is only four feet. The reason why it looks so strange is that the artist has left the natural foot space empty, instead drawing his feet in between. This confuses your brain and makes you see the space as the legs

Jastrow illusion with pieces of children's railways

Classic optical illusions

This illusion was discovered by Joseph Jastrow in 1889.

Pieces look different in size, in fact, they are the same.

These three lines look different in length, but in fact, they are the same

Classic optical illusions

Orientation arrows - that's what matters.

These lines look as if they are all of different lengths and are slightly offset, when in fact they are all the same length, and begin and end on the same axis.

Orientation arrows - that's what confuses your brain. The line where the two arrows point to the outside, looks shorter line located directly below it, the arrow is pointing inwards.