The Essence of ChaosChaos surrounds us. Seemingly random events the flapping of a flag, a storm driven wave striking the shore, a pinballs path often appear to have no order, no rational pattern. Explicating the theory of chaos and the consequences of its principal findings that actual, precise rules may govern such apparently random behavior has been a major part of the work of Edward N. Lorenz. In The Essence of Chaos, Lorenz presents to the general reader the features