The human brain is a super-powerful organ that is capable of simultaneously performing a huge number of tasks. One of its functions is information processing. The volumes of the latter are simply unimaginable, but, fortunately, most of it is analyzed unconsciously. The brain selects only the necessary information. The one that he considers useless, he sends to the "pantry". Perhaps the time will come, and it will be needed.
Optical illusions are a prime example of information. The human brain only picks up the obvious things. To reveal hidden information, it is necessary to strain the organ. Such training is very beneficial for the brain.
