A bear and a whale
"For that reason the conflict cannot be brought to an issue; the disputants can no more come to grips than, in the familiar simile, a polar bear and a whale. A true decision can only be reached when they both meet on the same ground. To make this possible is, I think, the sole task of our therapy."
Freud, S., 1917. "Introductory Lectures on Psychoanalysis: Lecture xxvii: Transference". In The Standard Edition of the Complete Psychological Works of Sigmund Freud, Vol. 16, 431-447. Translated and edited by James Strachey. London: Hogarth Press. p. 433.
