It was a tower of crap. Well, OK, it wasn’t exactly crap, more processed solid waste suspended in a gel matrix. And I suppose it wasn’t exactly a tower either, though I’m not sure what you’d call it. There’s no “up” in zero-G, so it could just as easily be long as tall. I was floating at one end of a long cylindrical shaft, the “tower” in question extending along the shaft’s center for what had to be half a kilometer.