Coming to understand a painting or a symphony in an unfamiliar style, to recognize the work of an artist or school, to see or hear in new ways, is as cognitive an achievement as learning to read or write or add.

Simons (1987) and Casati and Varzi (1999) show that the calculus of individuals can be grounded in either in a bit of set theory or in monadic predicates schematically employed. "The Calculus of Individuals and Its Uses" (with Henry S. OEG-0-9-310283-3721 (010) 1972.