But there's no way round it-commercial success is a mark of failure for a graffiti artist. We're not supposed to be embraced in that way. When you look at how society rewards so many of the wrong people, it's hard not to view financial reimbursement as a badge of self-serving mediocrity.

All artists are willing to suffer for their work. But why are so few prepared to learn to draw?

There are four basic human needs; food, sleep, sex and revenge.

Graffiti is one of the few tools you have if you have almost nothing. And even if you don't come up with a picture to cure world poverty you can make someone smile while they're having a piss.

I just wanna make the world a better-looking place. If you don't like it, you can paint over it!

Speak softly, but carry a big can of paint.

I don't know if street art ever really works indoors. If you domesticate an animal, it goes from being wild and free to sterile, fat and sleepy. So maybe the art should stay outside.