The Interpretation of Dreams by Sigmund Freud Chapter 2 Page 8

At home if there is a dish which the children decline, their mother first tries gentle persuasion, with a “Just taste it.” That the dream work should unhesitatingly use the double meaning of the word is certainly remarkable; ample experience has shown, however, that the occurrence is quite usual.

Through condensation of the dream certain constituent parts of its content are explicable which are peculiar to the dream life alone, and which are not found in the waking state. Such are the composite and mixed persons, the extraordinary mixed figures, creations comparable with the fantastic animal compositions of Orientals; a moment's thought and these are reduced to unity, whilst the fancies of the dream are ever formed anew in an inexhaustible profusion. Every one knows such images in his own dreams; manifold are their origins.