Blind man reading special books with his fingers. What features of the skin is this possible?

Books for the blind are printed in a special way, with embossed embossed holes-signs (Braille)
Well, if we talk about this feature of the skin, then:
Tactile sensations – due to nerve endings and various kinds of receptors located close to the surface of the skin, a person feels the influence of the external environment, thanks to tactile sensations (touch).



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