We already know how rooms are used symbolically. This representation may be extended, so that _windows and doors_ (entrances and exits from rooms) come to mean the openings of the body; the fact of rooms being _open or closed_ also accords with this symbolism: the _key_, which opens them, is certainly a male symbol. This is some material for a study of dream-symbolism. It is not complete, and could be both extended and made deeper. However, I think it will seem to you more than enough; perhaps you may dislike it. You will ask: “Do I then really live in the midst of sexual symbols? Are all the objects round me, all the clothes I wear, all the things I handle, always sexual symbols and nothing else?” There really is good reason for surprised questions, and the first of these would be: How do we profess to arrive at the meaning of these dream-symbols, about which the dreamer himself can give us little or no information? My answer is that we derive our knowledge from widely different sources: from fairy tales and myths, jokes and witticisms, from folk-lore, i.e. from what we know of the manners and customs, sayings and songs, of different peoples, and from poetic and colloquial usage of language. Everywhere in these various fields the same symbolism occurs, and in many of them we can understand it without being taught anything about it. If we consider these various sources individually, we shall find so many parallels to dream-symbolism that we are bound to be convinced of the correctness of our interpretations. The human body is, we said, according to Scherner frequently symbolized in dreams by a house; by an extension of this symbolism, windows, doors and gates stand for the entrances to cavities in the body, and the façades may either be smooth or may have balconies and ledges to hold on to. The same symbolism is met with in colloquialisms; for instance, we speak of “a thatch of hair,” or a “tile hat,” or say of someone that he is not right “in the upper storey.”[34] In anatomy, too, we speak of the openings of the body as its “portals.”[35] We may at first find it surprising that parents appear in our dreams as kings and emperors and their consorts, but we have a parallel to this in fairy tales. Does it not begin to dawn upon us that the many fairy tales which begin with the words “Once upon a time there were a king and queen” simply mean: “Once upon a time there were a father and mother?” In family life the children are sometimes spoken of jestingly as princes, and the eldest son as the crown prince. The king himself is called the father of his people.[36] Again, in some parts, little children are often playfully spoken of as little animals, e.g. in Cornwall, as “little toad,” or in Germany as “little worm,” and, in sympathizing with a child, Germans say “poor little worm.”