Art or graffiti?

Graffitti can be a terrible eyesore and Nottingham City Council have a crack anti-graffitti squad  who remove graffitti really quickly - 24 hours for offensive stuff and 48 hours for anything else. However, every now and then (and without condoning vandalism) you see something like the work above which is quite arresting.
These headstones appeared in the Rock City car park the day after both Jeremy Beadle and Heath Ledger died.