Why do people create art?

[Poet]

I cannot see the separation between making a cup of tea or painting the Sistine Chapel for they are both created and both art.

I would probably argue that art is not so much about the purposeful manipulation of the outside world like other activities because it is a far more spontaneous activity. Art can have no funktion or direct use. Somebody created the cup of tea with a clear purpose: To drink tea out of it so people can appease their thirst. But why was the painting of the Sistine Chapel created? Because it looks nice? You cannot really manipulate it like a cup of tea, and it is far more difficult to create. Maybe the difference just lies in the aesthetics a thing has.