Think of the brain as a living community of trillions of intertwining organisms. If you had a magical video camera with which to zoom in to the living, microscopic cosmos inside the skull, you would witness the neurons’ tentacle-like extensions grasping around, feeling, bumping against one another, searching for the right connections to form or forgo, like citizens of a country establishing friendships, marriages, neighborhoods, political parties, vendettas, and social networks. The brain is a dynamic system, constantly altering its own circuitry to match the demands of the environment and the capabilities of the body. But that textbook model is inadequate, and it misses the most interesting part of the story.
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