I finish the book so I can see how it's going to end. I write that first sentence, and if it's the right first sentence, it leads to the right second sentence and three years later you have a 500-page manuscript, but it really is like going on a trip, going on a journey. It's a voyage.
Whenever I finish a book, I go off and have some kind of adventure. Having had an adventure in my writing chair or on my writing sofa, an internal adventure, then I need to balance that off with an external adventure, so I'll go tramping through Africa or whitewater rafting or float to Hawaii in a martini shaker or something.
I like to think of myself as a fiction writer who liked art enough to write about it for a while, and then went on to his fiction.
I go into a gallery or museum, and I realize that I don't have to formulate any opinions if I don't want to. I don't have to think this thing through and write about it at any great length. I can think about it if I want to; if not, I can just walk out. So I can enjoy painting really a lot more than I could when I had that sort of pressure.