Physical art, as contrasted withconceptual art, refers to art that entirely exists in physicalreality, inspace andtime. Itsontological status is that it is aphysical object. The art is concretely realized but may beabstract in nature. For example, a painting, sculpture, or performance exists in the physical world. This is contrasted toconceptual art, some but not all kinds ofperformance art,computer software, or objects ofmathematical beauty, such as amathematical proof, which do not exist in themental world or inphysical world, but have other ontological status, such as inPlato's world ofideals. Here, the art may berealized in the physical world, such as amathematical proof written on a chalkboard, but refer to objects thatexists in themind asconcepts, not physical objects. Amusic performance is physical, while the composition, like computer software, is not.[1]