 And you don't need anything to cool or heat the building other than the earth itself. And the way, as you were saying, the way it's situated, the way it takes the sun in. And it just made me think, like, clearly not everyone's going to live here. But what if we just did it differently? Like, sure, that would be complicated. But what if we fundamentally built differently? It's just an interesting question. It absolutely is. Because, I mean, that's a huge contributor to the climate problem. We all know that. But we also know that we have...