The article discusses the case of Ian Waterman, who was diagnosed with a rare form of deafferentation, a neurological condition that caused him to lose all sensation and movement from the neck down. Despite this, Waterman was able to regain control of his body by using sight to judge the distance of his limbs from other objects. The article emphasizes the importance of touch and the somatosensory system in movement, and highlights the consequences of losing sensations.