The second, which I don't remember a lot about now except that I enjoyed it greatly at the time, was called Stone Work, and basically looked at the issue of building a stone wall. In July 1995 I copied out a shortish section of the book into a journal I was keeping at the time. Here's the extract from round about page 144:
Surgically deafened songbirds were found to
sing their songs as well after the surgery as before. (Science can be hideous.)
They sing, we must assume, by how the song feels to sing, rather than by how it
sounds. (But then any division of the sense is arbitrary. Auditory clicks
produce measurable electrical activity in the optic nerve. Are we seeing these
clicks? Is the eye hearing them?) To sing by feel rather than sound is to sing
by proprioception. The proprioceptors are nerve endings embedded throughout the
muscles, tendons, and joints of the body that read and report on relative position
of body parts, on movement, loading, acceleration and deceleration. They make
the musculoskeletal system the largest sense organ of the body, a receptor as
well as an effector. Proprioceptors are the neural devices that weigh and judge
and perceive whatever we do with that muscle, from performing eye surgery to
hitting high C to levering a two-hundred-pound stone into place in the footing
of a wall. They tell us where we are and what we’re doing as we are doing it;
they are our connection to the present tense of physical action. 