Bay Rate, who used to work at [Val]. Um, he gave a talk, where he was talking about entertainment minutes. That's what we create. Minutes of entertainment. Um, and that - I think that's an interesting concept. Because, you know, minute by minute, whether you're in a menu, or whether you're in a cut scene, or whether you're actively, you know, playing with the game, that - they're all equal. It's all time that you're in front of the iPad, or in front of the computer, interacting with the thing. The whole thing that's been created. And, so when we designed Monument Valley, we kind of had to figure out what the - what the form of the game was. What the structure was. And, it actually took us quite some time, to work out how to arrange, sort of, the pacing of the game. Sort of, the, you know, the - the structure of it. Um, you know, how the minutes of entertainment were arranged. And, we ended up realizing that around 10 minutes, 10 to 15 minutes was a - was a good amount of time, to sort of be in one location. And, in Monument Valley, we split up the levels into what we call chunks. And, a chunk is - is usually one screen. And, what you get is this really nice pacing. Where, um, people come into this location. And, they - they've never seen this place before. And, it's a different color palate. And, a different - slightly different architectural style. And, they play for a while. And, they - they kind of solve this chunk. This one screen. And, then they move to the next chunk. And - and, something's changed, something's different. So, we get this pacing where the player goes through three, or four, or five chunks in one level. And, then they get a big, triumphant ending. And, you know, for a mobile audience, you know, we're talking about a very - a more casual audience. They haven't - they don't have a lot of experience with games. That - we felt that that was a good way to keep their attention. And, to keep giving them new things to see. New animations. Um, new bits of sound and music. Um, that's what a level is. You know, a level, it's - it's like a beautiful children's book, you know. Or, I used to talk about Monument Valley as a walk through museum, you know. So, you know, maybe a level in Monument Valley is a bit like a walk through one wing of a museum. And, you don't want to be in there forever. You want to enjoy it, and see some cool things. And, then - and, then move on to the next, sort of, exhibit.