The need for a grounding of experience is consequent on the separation of subject and object. On the subjective side there is the implicitly felt self-certainty of existence which cannot be matched by anything arising on the objective side. To be fully grounded would be for the ontological gap between these two poles of experience to disappear. The self-certainty of the subject is never fully realised or experienced as such but is implied by the gap, it is known as a just-having-been. The split into subject and object brings about this polarisation, and is nothing but this polarisation, presented as an insoluble problem. The illusion is not the independent existence of a world outside of consciousness (which needs to be reclaimed by the subject) but the idea that subject and object are independent, and that consciousness belongs eminently to the subject. The subject is a confused misunderstanding of consciousness in which no separation into distinct poles can ever be found.