The blind read books written in a special type of dots. What analyzer do you think provides such an opportunity for a person?

Skin sensitivity, tactile analyzer, the receptors of which perceive mechanical impact on the skin, there are especially many of them at the fingertips.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.