Dr. Sachs discusses the dynamics of our deepest, seemingly ‘unconscious’ mental processes, and shows remarkable correspondences between them and metabolic processes such as protein synthesis and folding. He suggests, along firm idealist lines, that our body’s metabolism is simply a metaphor, the extrinsic appearance of our inner, ‘unconscious’ mental processes. In other words, metabolism may be what the deepest layers of our own mind look like, when displayed on the screen of perception. This is an involved essay and not the easiest of reads, but it is well worth the effort.