If, in short, it is a projective activity, which leaves objects all round it, like traces of its own acts, but which nevertheless uses them as springboards from which to leap towards other spontaneous acts, then it becomes understandable that any 'content' deficiency should have its repercussions on the main body of experience and open the door to its disintegration, that any pathological degeneration should affect the whole of consciousness and that nevertheless the derangement should on each occasion attack a certain 'side' of consciousness, that in each case certain symptoms shoulddominate the clinical picture of the disease, and, in short, that consciousness should be vulnerable and able to receive the illness into itself.