Man’s need of precise definitions rests on the Law of Identity: A is A, a thing is itself. A work of art is a specific entity which possesses a specific nature. If it does not, it is not a work of art. If it is merely a material object, it belongs to some category of material objects—and if it does not belong to any particular category, it belongs to the one reserved for such phenomena: junk.
“Something made by an artist” is not a definition of art. A beard and a vacant stare are not the defining characteristics of an artist.
“Something in a frame hung on a wall” is not a definition of painting.
“Something with a number of pages in a binding” is not a definition of literature.
“Something piled together” is not a definition of sculpture.
“Something made of sounds produced by anything” is not a definition of music.
“Something glued on a flat surface” is not a definition of any art.There is no art that uses glue as a medium. Blades of grass glued on a sheet of paper to represent grass might be good occupational therapy for retarded children—though I doubt it—but it is not art.
“Because I felt like it” is not a definition or validation of anything.
There is no place for whim in any human activity—if it is to be regarded as human. There is no place for the unknowable, the unintelligible, the undefinable, the non-objective in any human product. This side of an insane asylum, the actions of a human being are motivated by a conscious purpose; when they are not, they are of no interest to anyone outside a psychotherapist’s office. And when the practitioners of modern art declare that they don’t know what they are doing or what makes them do it, we should take their word for it and give them no further consideration.
Excerpt from "Art and Cognition",The Romantic Manifesto, by Ayn Rand