"The cluster version of the family resemblance view has been defended by a number of philosophers (Bond 1975, Dissanayake 1990, Dutton 2006, Gaut 2000). The view typically provides a list of properties, no one of which is a necessary condition for being a work of art, but which are jointly sufficient for being a work of art, and which is such that at least one proper subset thereof is sufficient for being a work of art. Lists offered vary, but overlap considerably. Here is one, due to Gaut: (1) possessing positive aesthetic properties; (2) being expressive of emotion; (3) being intellectually challenging; (4) being formally complex and coherent; (5) having the capacity to convey complex meanings; (6) exhibiting an individual point of view; (7) being original; (8) being an artifact or performance which is the product of a high degree of skill; (9) belonging to an established artistic form; (10) being the product of an intention to make a work of art (Gaut 2000)." - Stanford