Art is surely not bound by artefacts any more than intelligence is bound by a cranium. Generating value in art is really only a function of the extent to which an artefact (as a concept) directly, indirectly or even – in some instances and as a corollary of entropy, inversely – renews or reinvents the sustainable continuity of a cultural, economic and abstract (logical) information and energy-processing (i.e. computational) system of which it is a component part.
A curious sidestep into intelligence is that the utility and attributable value or meaning of any particular information-processing system as complex soliton and problem-solver is only what it is to the extent that it facilitates the sustainable continuity of organism, culture, corporation or – in extremis – civilisation.
Art is rendered useful through the ways it asserts recombinatory creativity as an autonomous solution to the open question of optimally-concise algorithmic information encoding, compression and transmission (through a medium of minds and artefacts or integrated value systems). Art and intelligence represent instances as components of a more general dynamical symmetry that is only rendered intelligible in and as a self-reflexive computational microcosm.