Certain, or perhaps all, stubborn psychiatric conditions owe their existence simply to that of consciousness, in their intractability they assert the existence of consciousness - in a context where it could well be denied in favour of purely behavioural criteria. The same could be said of all quirks, failings, parapraxes - the evidence for the Freudians of the existence of the unconscious is now all we have as evidence for the existence of consciousness. It inserts itself into the metaphoric equation as the factor that prevents it from being resolved, and so anything in a literal equation that does the same also points to consciousness. This is more than humanism, it goes right down to the shape of things, to the failings of structure, if you let it.