If Michaelangelo or Leonardo Da Vinci were alive today they’d be making Avatar, not painting a chapel.

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.

Nothing in the world is more common than unsuccessful people with talent, leave the house before you find something worth staying in for.

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.

Imagine a city where graffiti wasn't illegal, a city where everybody could draw whatever they liked. Where every street was awash with a million colours and little phrases. Where standing at a bus stop was never boring. A city that felt like a party where everyone was invited, not just the estate agents and barons of big business. Imagine a city like that and stop leaning against the wall - it's wet.

Some people represent authority without ever possessing any of their own.

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.