Leaving aside therefore a set of problems that were added at a fairly recent date to the experience of madness, we shall now endeavour to sketch out the structures that rightly belong to it, beginning with the most exterior ones (the cycle of causality), moving on to the more interior and less visible ones (the cycle of passion and image), and finally attaining, at the heart of that experience, that which made it what it was, the essential moment of delirium.