I have mixed feelings about graffiti. Some are no more than expressions of vented spleen or a way of marking the territory. Obscenities, threats or signs meaningful only for the members of the gang...
But there are others, clearly created by talented rascals, some of them true works of art. The City of Ljubljana has even sponsored a project in which a team of 'artists' would decorate with graffiti art an otherwise desolate underpass.
The photo is not of their work, though. I just came across this combination of urban and natural and found it interesting.