In [[Object Oriented Ontology]], it is said that a hammer does not exist until you use it to hammer. Until it is in use (what Heidegger called 'ready-to-hand') it is merely a collection of wood and metal. Things become a hammer when used to hammer.
Performance art is active and requires the viewer to be passive and take it in. Sculpture is passive and requires the viewer to be active - to be the performer. It waits for you to encounter it.
This was articulated by Phyllida Barlow in Cul-de-sac at the RA.
This means that the idealised viewpoint of traditional art is dead.