I sit for two or three hours and then in 15 minutes I can do...

I sit for two or three hours and then in 15 minutes I can do a painting, but that's part of it. You have to get ready and decide to jump up and do it; you build yourself up psychologically, and so painting has no time for brush. Brush is boring, you give it and all of a sudden it's dry, you have to go. Before you cut the thought, you know?