Patterns in a Bach fugue

Rupert finds comfort in the patterns of his hallucinations, which originate in music. This clip illustrates a Bach Prelude and Fugue, making such patterns easy to see. See the theme that looks like a crab claw. See it turn upside down, backward, flipped. And see how the whole piece is made of fragments of the theme, the fragments themselves reversed, elaborated upon. Imagine how these patterns would develop in Rupert’s mind.