"Usually when you're playing with other people in not such a reverberant room, you have to be quick on your feet and think about stuff really quickly. But inside the cistern, it was almost like I was at home on my computer arranging and taking time thinking about the next step, the next note. Instead, the room was my collaborator. I could hear the note and sit there and think. I could be arranging as I was going in real time, which was fascinating."