My definition of art contains three elements:
Art is made by a human being.
Art is created to have an impact, to change someone else.
Art is a gift. You can sell the souvenir, the canvas, the recording… but the idea itself is free, and the generosity is a critical part of making art.
By my definition, most art has nothing to do with oil paint or marble. Art is what we’re doing when we do our best work.