You're filled with so much life. Is there any reason why all of us are not full of life?

Society tells you that when you're old you have to retire. You have to defy that.

I always believed that my work should be unfinished in the sense that I encourage people to add their creativity to it, either conceptually or physically. Back in the 1960s, I was calling for 'Unfinished Music,' number one, and number two, with my artwork - I was taking unfinished work into the gallery. And that's how I was looking at it.

But think of the violence, it could happen to your kids.

Not being appreciated for 40 years or something ... It feels like I was accused of something that I didn't do, which was breaking up the Beatles. That was like being somebody who is in prison without having done anything wrong.

Marriage is a gamble, let's be honest.

People accuse artists of being narcissists - of course we are! If we don't like ourselves, who's going to like us?