I think I can. The word that comes to mind is 'unique'. It would separate my (hypothetical) run-of-the-mill house from the masses, make it mine for a reason -- and it would energize me every single time I walked in the door. Spending time in my house would be that much more beautiful, and that's totally unquantifiable. (A bit similar to the difference between getting home every night to a TV dinner and a football game, or getting home to a wife and kids, if I may be so dramatic.) So it's not the value of the art, exactly. I'm trying to figure out in my brain if graffiti by a different artist would have the same impact -- I'm mentally replacing Banksy's art with some of my favorite Austin street murals, this is kind of fun actually -- and I've decided it totally would. But Banksy's street art is gorgeous and thought-provoking, so you know what you're getting. Hope that answers a bit.