Yeah, the wastage of the "average" home bugs me, but there's got to be lower hanging fruit than somehow living in spheres. Even just a cylinder would give you some great improvement (and it would be mostly rectangles, with normal windows), but even better than that? On the other side of the wall I am typing this at, there's a heat engine removing heat from a freezing box, but then it has to drop all that heat into the space I am sitting in . . so then another box has to try and get the heat outside. Oh! But wait! There's another box that HEATS UP - a lot! - so I can put food in it. Another one dries my clothes, and makes hot water, both of them putting heat back in. Jiminy beeswax. Not even going to touch the way water is brutally wasted in the typical setup.