 A fourth hybrid definition is the “buck-passing” view of Lopes, which attempts an escape from the stalemate between artwork-focused definitions over avant-garde anti-aesthetic cases by adopting a strategy that shifts the focus of the definition of art away from artworks.  The strategy is to recenter philosophical efforts on different problems, which require attention anyway: (a) the problem of giving an account of each individual art, and (b) the problem of defining what it is to be an art, the latter by giving an account of the larger class of normative/appreciative kinds to which the arts (and some non-arts) belong. For, given definitions of the individual arts, and a definition of what it is to be an art, if every artwork belongs to at least one art (if it belongs to no existing art, then it pioneers a new art), then a definition of artwork falls out: x is a work of art if and only if x is a work of K, where K is an art (Lopes 2014). When fully spelled out, the definition is disjunctive: x is a work of art if and only if x is a work belonging to art1 or x is a work belonging to art2 or x is a work belonging to art3 …. Most of the explanatory work is done by the theories of the individual arts, since, given the assumption that every artwork belongs to at least one art, possession of theories of the individual arts would be necessary and sufficient for settling the artistic or non-artistic status of any hard case, once it is determined what art a given work belongs to. As to what makes a practice an art, Lopes’ preferred answer seems to be institutionalism of a Dickiean variety: an art is an institution in which artists (persons who participate with understanding in the making of artworks) make artworks to be presented to an artworld public. (Lopes 2014, Dickie 1984) Thus, on this view, it is arbitrary which activities are artworld systems: there is no deeper answer to the question of what makes music an art than that it has the right institutional  structure.[4]  So it is arbitrary which activities are arts. Two worries. First, the key claim that every work of art belonging to no extant art pioneers a new art may be defended on the grounds that any reason to say that a work belonging to no extant artform is an artwork is a reason to say that it pioneers a new artform.  In response, it is noted that the question of whether or not a thing belongs to an art arises only when, and because, there is a prior reason for thinking that the thing is an artwork.  So it seems that what it is to be an artwork is prior, in some sense, to what it is to be an art.  Second, on the buck-passing theory’s institutional theory of the arts, which activities are arts is arbitrary.  This raises a version of the question that was raised about the cladistic definition’s ability to account for the existence of art outside our (Hominin) tradition.  Suppose the connection between a practice’s traits and its status as an art are wholly contingent. Then the fact that a practice in another culture that although not part of our tradition had most of the traits of one of our own arts would be no reason to think that practice was an art, and no reason to think that the objects belonging to it were artworks. It is not clear that we are really so in the dark when it comes to determining whether practices in alien cultures or traditions are arts. 