That’s a really good question. I don’t think you ever know; you just have to make a call. Finishing is acknowledging that there’s no further progress to be made at the current juncture. If you sit on a song for 20 years and come back to it with all the wisdom of your life, you could probably write a better song, but objectively, you have to get it out into the world in order to continue to live as an artist. So, there’s a sense of: “well, this is as good as it’s gonna get for me at my level right now.” Sometimes you realize that early, but it can take a long time. I think deadlines were invented by God to make art possible. I don’t think I could finish anything without a deadline, self-imposed or external. With the book, it was just: these people at Penguin, they don’t know me. They have no idea that I can’t do this. I have to do it because otherwise they’ll know that I can’t do it.

Well, the problem with architecture is that it’s a long process. Many of the bigger projects that we have — and even the smaller ones — tend to take three years minimum but they can also go on for five or 10 years. So there is no real single defining moment in the way that there sometimes is with other creative processes. It’s not like in theater, where you think, “Okay, tonight’s the opening night,” and then you all go out for a drink afterwards. A building is progressively being completed, even on the day of the opening! I think the point when you can really stand back is a little bit later, maybe one year later.

My mind is nearly like an infinite tunnel of potential ideas, but the ideas are all a part of what is already there. In my imagination, I always think there are more parts to record. Then when I work it through, I make it to a certain point and I’m like, “Actually, that’s enough.” Some of the extra bits that I’m thinking of are suggested anyway by interaction with what is already there, and it gets to a point where to add anything more would just be too much. I often imagine recording parts that people actually do hear, but are not actually there. By the time I’m done with the main guitar and other elements, [more parts] don’t capture anything else with all those suggested things. If I try to realize them, it’s less effective. I think that’s why people have often said they hear different things depending on how they listen to [our music].

It feels most natural to have a lot of projects in motion simultaneously. I need the freedom to initiate and abandon a variety of works, be it a painting, performance, video, or even a book project. If I come back to a piece that doesn’t resonate anymore, I might toss it out completely or turn it into “studio mud,” where it gets broken down and becomes material for something else. I know when something’s done because it clicks and just feels right.