Some pictures we develop very much by keeping them often before us; the pictures of enemies, for instance, or of friends of whom we often think. Other pictures are very little developed, they just come and go. That is why sometimes in the dream we see the faces of our friends just as they are, sometimes we see forms that seem familiar but whom we do not recognize, and sometimes we see pictures that seem quite strange. Two or three of the pictures that are little developed join and form one picture which seems familiar.