Magic or science or something else entirely, it was dangerous and automated and unable to be disabled; that was the important part. Roger nodded. "There's a lot about this place I don't understand myself," he said. "For whatever that's worth. Right now the important thing is, that place is here and we can't get rid of it, so we'd better make sure nobody does anything dangerous with it. I haven't got anything to write with or bar the door, though, do you?"