In the foregoing exposition we have now learnt something of the dream work; we must regard it as a quite special psychical process, which, so far as we are aware, resembles nothing else. To the dream work has been transferred that bewilderment which its product, the dream, has aroused in us. In truth, the dream work is only the first recognition of a group of psychical processes to which must be referred the origin of hysterical symptoms, the ideas of morbid dread, obsession, and illusion. Condensation, and especially displacement, are never-failing features in these other processes. The regard for appearance remains, on the other hand, peculiar to the dream work. If this explanation brings the dream into line with the formation of psychical disease, it becomes the more important to fathom the essential conditions of processes like dream building.