What is an example of a motif (recurring theme) used in the novel, Legion?

One motif is that of the carp swimming in Kinderman's bathtub for purification before eating, a homey detail and source of amusing complaint by Kinderman.

Another motif is that of doubling: James Vennamun became what he was because of the death of his brother, Thomas; Dr. Amfortas sees his own double and converses with it; even the multiple possessions form a kind of doubling, the invading spirit opposed to the invaded body.