Optical illusions are complex images that cause us to perceive things differently than they actually are.
These illusions demonstrate how our brain interprets visual information and remind us that our perception is not always as accurate as we believe it to be.
There are three types of optical illusions: literal, physiological, and cognitive.
In the image above, a grid with the letters S is visible.
If you pay attention to the features in the image, you may be able to rapidly identify the number.
Readers with excellent visual skills will be the first to spot the number faster than others.
The number 5 can be spotted on the left side of the picture. It is hiding in the 2nd column.