Wittgenstein argues that there is no necessary and sufficient condition for caling something 'art". Art is an open concept that ties activities together through overlappling family resemblances. This is called the "family resemblance theory". We could never have a specific definition of art because at some future date something else might be included in the category of art. We simply have to decide whether to use a coertain concept or term to refer to the activity in question. In contrast to logical or mathematical concepts, concept that are based on cmpirical obsevations or normative judgments aresimply stipulated as to their ranges of use. The decision is based on whether the overlaps in family resemblances are similar enogh to warrant calling something art.
