A painting of Hebrew letters by the Israeli painter David Rakia. Wikipedia
Ever since Freud’s pioneering investigation of dreams, we have known how capable the unconscious mind is of puns, complex verbal allusions, and intricate word play. But can dreams also put this ability to use in performing arithmetical calculations that most of us would have difficulty doing in our heads when awake? As one says in Yiddish, hert a mayse: Listen to a story.