Abstract
Art is a language. Art objects are therefore decipherable into more or less elaborated and restricted codes. These codes change with the relative solidarity of the community in which they are produced. The more solidary the group, the more restricted the code; the less solidary the community, the more elaborated the artistic codes they produce. In general, realism is a more elaborated code and abstraction a more restricted code, and accordingly more solidary communities should produce more abstract art and less solidary groups should produce more realistic art. This theoretical relationship between artistic codes and group solidarity is captured in the idea of a "semantic equation" and is applied to changes in the styles of New York art from the 1940s through the mid 1980s