On the Construction of Movements
Let us start this essay with a brief myth. Imagine that we have found the story among dusty manuscripts in a corner of an old secondhand book store:
When Zeus created the living beings and placed them on Earth, he gave each of them brains that would best fit their owners. He gave the fish a brain that allowed it to swim, wriggle, and swallow the tasty, thick water. He gave the frog a brain that made it as bouncy as a wet rubber ball. He gave brains to the snake and to the turtle; he gave their share to the running, swimming, crawling, and flying birds that fill the sky. He also did not forget about the furry four-legged creatures, marsupials, rodents, and insectivores. He gave brains to the double-hoofed rhinoceros and to the single-hoofed horse, to the beaver and to the squirrel, to the walrus, seal, bear, and tiger, and even to the Bornean pot-bellied orangutan, and even to the gloomy African gorilla. . . . Man was the last to come.
"Here," said Zeus with a touch of pride, giving the Man something looking like a pink paté on a plate. "You will be happy with what I give you. This is cortex of large hemispheres that I have endowed with many wonderful features. Look, this place will give you speech. That one will help you understand other people. This convolution will make you grammatical; that fissure will let you write; this corner will let you enjoy music; that part will make your right hand your trustworthy and reliable assistant and will let it master the most complex tools. All these things are for you, and for you only, my beloved child, and none of the other creatures will have them. Are you happy?"