Homunculus, a sensory map of your body. The homunculus looks rather strange because the representation of each area is related to the number of sensory neuronal connections, not the physical size of the area.
IN PLAIN ENGLISH: The size of his hands represent how much of our brain’s processing power is devoted to our hands. That shouldn’t surprise anybody given the complexity of activities our hands are involved in. And in case you didn’t notice, note how much processing power is devoted to, as my mum might say, the private parts. That shouldn’t surprise anybody either.