Writing graffiti is about the most honest way you can be an artist. It takes no money to do it, you don't need an education to understand it, and there's no admission fee.

If you are dirty, insignificant and unloved then rats are the ultimate role model.

You're mind is working at its best when you're being paranoid. You explore every avenue and possibility of your situation at high speed with total clarity.

It's impossible to predict which paintings will last and which won't. In New Orleans I painted on a dilapidated shop in a street littered with abandoned cars and rotting mattresses, then two hours later the piece was gone. It turned out I'd picked the side of a crack house and the proprietor didn't like the attention.

I wanted to highlight the destruction in Gaza by posting photos on my website - but on the internet, people only look at pictures of kittens.

If you feel dirty, insignificant or unloved, then rats are a good role model. They exist without permission, they have no respect for the hierarchy of society, and they have sex 50 times a day.

People say graffiti is ugly, irresponsible and childish... but that's only if it's done properly.