OT, but has anyone ever studied what motivates graffiti producers? I assume it is a mix of teenage boredom / rebelliousness and gang territory signifiers, but I would be interested in reading more about it. I'm more interested learning about the motivation for the "scribbles" form, rather than the more artist versions.

The fins are actually kind of brilliant. Looks like it will hamper both paint markers and knife scratchers. The spray painters will just have to be painted over, though. Two out of three ain't bad!

Looks like an opportunity for some abstract graffiti that looks different depending on your angle.

This is stupid. The people of San Fran should be reimbursed the million dollars this cost. By who, I don't know.