# A new optical illusion has puzzled thousands of people on the Internet.

You can not even imagine how easy it is to cheatour brain. A strange and at the same time quite interesting optical illusion is gaining popularity on the Web, forcing users to guess what they really see: a black and white photo or a color photo. Created as a visual experiment by a Norwegian artist and programmer Oyvind Kolos, an image with a colored grid over the original image seems to be completely colored to many. How does this effect arise and why can a color grid change the perception of the entire image? Let's see.

What do people see in this image?

Kolos originally published a black and white shot withput them on top of the original image color grid on his page in Patreon. The photo was taken in 2011. In the picture are teenagers taking pictures of a turtle. Photos quickly got into the social network Reddit, where users began to argue about whether the picture seems to be colored because of the color grid.

According to many users, they first evendid not see the colored stripes in the image. Others noted that they did not see the grid of red, blue, green, orange and yellow colors at all and perceive the image as colored. At the same time, some people point out that they do not see the illusion at all.

How does optical illusion work?

According to the photographer Stanislav Rzhevsky, who gavea comment to the “360” edition, then, in what colors the photo is illusively colored, is determined by the color of the printed grid itself. Our usual brain doesn’t try to understand the details of the image, which in this case are exactly the colored lines of the grid.

Similar effect of optical illusion, but with a different photo

If the vision distinguishes the elements of the grid, theyperceived alien in relation to the picture, and illusions do not arise. However, if you defocus your vision, postpone a picture, or move it to the periphery of the visual field (squint, for example), then the perception of the color grid and photographs “mix” by coloring the image, the expert says.

In other words, if you do not peer intothe image, it will seem that in front of you is a color photograph. But one has only to look closely, and it immediately becomes clear what the catch is. The effect of a color photo also disappears if to increase the image. Then it becomes clear that the photograph is black and white and that simple colored lines are drawn on it.

It should be added that the effect of a similar opticalThe illusion is achieved not only with the help of the color grid. Although the net does give a better result, Kolos also tried another method. He painted color dots on other photographs and simply straight horizontal lines. The result can be viewed below.

Moreover, the effect of illusion can work not only with static images.