Does the gallery charge for viewing? I'm sure, even if they don't, it enhances their collection and makes them more visible and thus more successful by way of donations, sponsors, etc. It's almost like they're getting free art - and not art by little Johnny from elementary school, but art that is renowned and popular. Very interesting debate, but I agree that the gallery has no right to go and take it. I mean, could I go and take it and put it in my basement? Or did they get permission from the property owners?