Whatever is seen, done or experienced already contains the hidden presumptions of seeing, of action and of bare experiencing, all of which necessarily appear like nothing at all, like an empty field, in the naïve accompanying understanding. And yet through all kinds of logical friction we have gained the idea of preconditions, of certain positive contents, of an a priori, the preconditions for that appearance action etc. This move, from X to the preconditions for X, has us intoxicated. In its true metaphysical instance it is hard - the genuine hard problem? - and almost impossible, the opening of a crack in reality. In its debased instances, within the understanding it continues to wreak havoc on our world. It's the genie out of the bottle. It won't go back in and it won't be tamed. It must be pushed until it devours itself.