However far-fetched and improbable our dreams may seem to the waking mind, they are, from the point of view of the sleeping mind, serious and careful attempts to construct an adequate theory of the phenomena. The imagery is sought from far afield only to fit the facts more accurately. Thus a lady dreamed that her dog was being crushed out flat in a large old-fashioned box-mangle. She awoke to find that water from a burst pipe was falling from the ceiling on to the floor on the landing outside her door, close to where the dog had his bed. She had never seen a mangle of this kind since she was a child, or had any occasion to think of it, but the rhythm and sound of it somewhat resembled that of the falling water. One more example of an auditory dream may be given. I dreamed that I was back in a schoolroom of my boyhood, with two or three of the present masters. The room had been entirely changed, and it contained much new school apparatus and, notably, on a table, several miniature engines, of different character, actually working. I said to the masters that I wished all these apparatus had been there twenty years ago (a considerable under-estimate of the actual interval since I left that schoolroom), so that I might have enjoyed the benefit of them. 'All life is made up of machinery,' I found myself uttering aloud as I awoke, 'and unless you understand machinery you can't understand life.' It was not till some moments later that I became conscious of a faint whirring sound which puzzled me till I realised that it was the sound of distant machinery entering through the open window. This had, undoubtedly, suggested the engines of the dream, though I had not been conscious in my dream of hearing any sounds, and the small size of the dream engines corresponded to the faintness of the actual sounds. Dreams aroused by odours do not usually seem to occur except on the experimental application of them to the sleeper's nostrils, and experiments in this direction are not usually successful.[65] Occasionally, however, smell dreams occur without any traceable sensory source, and Grace Andrews, for instance, records a dream of the sea, accompanied by the seashore odour, 'a pure and rich sensation of smell.' In my own case olfactory dreams have been rare and insignificant.