Watercolor Wednesday: Disposable art?

This painting no longer exists – my dad painted it over, saying it was such a nice big canvas (it’s rather large). I rather like it, but I always enjoy his more abstract works and love a nice cityscape. 

So is this still art? What is art if it’s disposable? A friend posed a provocative question along these lines in a writers group I’m part of, along with this fascinating video: “Is art meant to be consumed or preserved? (Or is it/can it be both? How?)”

What do you think, and why?