  Why distinguish between the work of art and its vehicle, manifestation, or control object? Various reasons have motivated such distinctions. One line of thought is that a work is “constituted” by a material object or vehicle, where the constitution relation is not a matter of identity (for background, see the entry on material constitution). Roger Pouivet (2000, 2010) has brought such arguments to bear on a number of issues in the ontology of art. Simon J. Evnine (2009, 2016) develops a constitution theory as well.