People often seem to be claiming new and interesting things (like unmade beds) are art, and other people saying no that can not be so! But nobody can impose a strict limit, someone will always point to something new and say ‘aha! but that should/n’t be art, and you say it is/n’t!’
I think that just like Chomsky argued that language exists in the mind of it’s speakers, art exists in the mind of it’s appreciators. You create or observe, and in your mind that is art, and so it is art. There’s no defining boundary outside of our minds as to what a work of art is, although we might try to create one that mirrors the one in our head.