ABSTRACT
If we ask the “What is it” question of an item in our experience, one thing we are asking is, what changes can that item endure and still remain what it is? … Matter might look at first like the most enduring substrate, in that it persists through … birth and death … [But in] general, no list of particular materials will give us a substrate as stable and enduring as … form or organization.… That is the nature of living things—to be forms embodied in ever-changing matter. (Nussbaum & H. Putnam, 1992, p. 29)
