I wish I could say something intelligent about this but all I got is "wtf?" so here's some bs

The artist is a person who can create something out of nothing. Art, in the case of books, are stories made through the mind of the author, and are whatever the author wants it to be. Books have so much purpose in the world. They entertain people and teach people, but people can be entertained and taught without books. This gives books no purpose. Essentially, everything has no purpose because humans would make due with whatever they have to fill in the spots of what they lack. Music can be replaced with poetry which can be replaced with fiction which can be replaced with plays, and so on. To some people, music is everything, but if music never existed, then maybe poetry would be everything to that person. One thing with a seemingly obvious meaning can be interpreted in many different ways. That is what I think Oscar Wilde is trying to say. That art can be made and destroyed by people, loved and hated by people, and so its meaning is very deep and unforgettable, but it is so meaningless because it can be replaced.