See The Nordic Journal of Aesthetics ,
Vol. 23, No. 42 (2012), pp. 14-31,
"Art in an Expanded Field: Wittgenstein and Aesthetics,"
by Noël Carroll.
Abstract:
"This article reviews the various ways in which the later writings
of Ludwig Wittgenstein have been employed to address the question
'What is Art?' These include the family resemblance model, the
cluster concept model and the form of life model. The article defends
a version of the form of life approach. Also, addressed the charge that
it would have been more profitable had aestheticians explored what
Wittgenstein actually said about art instead of trying to extrapolate from
his writings an approach to what Nigel Warburton calls the art question."