So we've agreed that the brain is a complex system that somehow manages to work as a control system for the body. It receives info from the body (input), info from itself (state), and produces info for the body (output). For now, however, let's forget that it's a control system for the body and let's just focus on the fact that it's a complex system. So what's a system? Imagine a set of pieces that interact among them: a clock? the brain? a beehive? a city? they all are systems. Some more complex, some less. This explanation could become way more complex but there's no need (pun intended). A complex system is also a system... only it has extra characteristics: 1) it's conformed by an unusually large number of pieces, 2) the pieces are very similar, and 3) the pieces have relatively many relationship among them. Known complex systems are: The brain, cities, weather, economy, etc. There's also an artificially made complex system cal...