With numerous articles about optical illusions with images that trick the mind orbiting social media, you’ve probably wondered how they work.

One of these images is the one shown in this article and apparently only 1% of the people can solve it. The photograph is supposed to have an animal (panda) that a very low percent of people can see.

This visual illusion is called an afterimage since you’re removing the stimulus but the sight persists. Scientists claim that it results from a continued activation of our visual system.

Strong colors make a bigger impression on the visual system. They trick it into believing that you’re still seeing the colors when they’re not there.

You can test it yourself with the images below (the test is not harmful; it will affect your vision only for a while).