A baby sees colored images as gray spots in a fog. After birth, he does not have the ability to distinguish individual colors. Only after a few months does he begin to perceive the color red and gradually more are added. Therefore, large contrasting patterns attract his attention the most. The details are not important at first. Simple shapes do not overwhelm him, on the contrary, they interest him because they appear more obvious to him. The images in the leporel will naturally support the baby's desire to discover and explore the world.