The problem with Art is that most of it discusses extensional bullshit that doesn’t necessarily have an application with reality. It deals with institutionalism, critics, and overwhelming theories. What qualifies as good are in my personal experience is when the viewer and the maker both walk away having change something in their lives. Great art causes more than inspiration; it causes change.
Marshal to show up introduced the concept of a ready-made object. His idea why art Can be and the materials for it revolutionize art from early 20th century onward. Jackson Pollock introduce or to put it better became famous for abstract expressionism.
Great art makes history