Source : https://saintif.com/
At first glance, the photo above looks in color, but if you look in more detail, it turns out the photo above is black and white, friend! This illusion was created by Øyvind Kolås who is a digital artist for experiments. The technique above is called the color assimilation grid illusion where colored lines that have high saturation are placed on top of a black and white image so that the image looks colored.
Source : https://saintif.com/
How does our brain see it as a color image? It turns out that according to Bart Anderson from the University of Sydney the human brain works by predicting the reality of an image even if only a little information is provided. The color lines in the photo are information. Several other photos were given different color lines, the results remained the same, the image looked colored. It was discovered that not only colored lines, colored dots can also produce the same effect.
Source : https://saintif.com/
Apart from that, it was also found that the illusion also works on moving videos, not just still images. It's really exciting!