the room and everything in it, and it will keep on doing so for years and years. leave a towel in the room over night, and the next morning every thread of the towel will smell of musk. you could go on leaving towels in the room for a dozen years and taking them away after one night, and every thread of every towel would show that the musk had been near it. that means that every one of the threads of every one of the towels has several particles of musk on it; and it means that the original piece of musk (which seems hardly to grow any smaller) 