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

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.