What metaphors are used in Art & Fear: Observations on the Perils (and Rewards) of Artmaking by David Bayles?

The authors describe metaphor, as art requires metaphor. It can rarely represent things as they actually are, and when it does so, sometimes direct representation is boring and fails to get at the deep reality behind what is being represented. Metaphor aids our understanding of ideas and reality and, in a way, acquaints the artist and the viewer with reality again.