Artificial Life - Complexity, Entropy and Complex Systems. Complexity and Entropy Everything in the universe exists on a sliding scale of entropy. Things very cold and still are at one end and things muddled, hot and moving rapidly are at the other.
Life sits in the middle some where.
For example, consider a system of gas molecules in a box. The molecules can be thought of as little billiard balls continually colliding with each other and bouncing off the walls of the box. The higher the temperature of the gas, the faster the molecules move, and so the more frequently and harder they collide with the walls of the box and the greater the outward pressure they exert on the walls. Suppose that the molecules are all confined to the left-hand side of the box by a partition. If the partition is then removed, the molecules will tend to spread out an occupy both halves of the box.