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Technically, you have no right to touch property that is not yours. Even if it is a concrete wall. On the other hand, you might increase the value of it by making a nice "picture" there. But you might also not... There is an ethical conflict in grafitti that a youth cannot see. That's why usually people who get older quit (or just stick with legals). I perosnally don't mind grafitti on public walls, rusty old trains and metros and stuff like that. But I am very upset when I see it inside the new metro or even on the historic buildings! Because a nice historic building has a much greater art value then a few colore fields with an outline...Yep...Someone in last years Art class did a whole project on graffiti and it does look very good when done properly...as long as it isnt done on peoples personal property or important areas. An old concret wall belonging to no-one at the side of the road is fine...Thats my opinion though.
On the other hand, you might increase the value of it by making a nice "picture" there.
....I am tired of my money having to go to remove these things.
I see what both of you mean, and agree with both...Yes, 95% of the time its just vandalism which would piss me off if I was paying taxes etc and if it was on my property...but that said some of it, despite the fact it could be somewhere unacceptable, could be really good art if you leave all the negative factors out and just look at it as art...If you know what I mean.