Policemen and security guards wear hats with a peak that comes down low over their eyes. Apparently this is for psychological reasons. Eyebrows are very expressive and you appear a lot more authoritative if you keep them covered up. The advantage of this is that it makes a lot harder for cops to see anything more than six foot off the ground. Which is why painting rooftops and bridges is so easy.

Is graffiti art or vandalism? That word has a lot of negative connotations and it alienates people, so no, I don't like to use the word 'art' at all.

A lot of mothers will do anything for their children, except let them be themselves.

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.

If you want to say something and have people listen then you have to wear a mask. If you want to be honest then you have to live a lie.

There's obviously nothing wrong with selling your art - only an idiot with a trust fund would tell you otherwise. But it's confusing to know how far you should take it.

Gaza is often described as 'the world's largest open air prison' because no-one is allowed to enter or leave. But that seems a bit unfair to prisons - they don’t have their electricity and drinking water cut off randomly almost every day.