One job of the unconscious is to act as a workshop for rough-shaping ideas; crafting notions as new parts or tools become available; storing observations until something relevant appears in the landscape -- generally soaking, simmering, and incubating ideas. Gradually, while combing through its inventory, it finds bits and pieces that create a pattern. When it slips knowledge of that pattern to the conscious mind, it's a surprise, like a telegram slid under the door.

Author: Diane Ackerman