Idealism doesn't need much metaphysics beyond the premise that the realm of the mind, which includes all ideas of experience, cannot be dominated by its own objectivities, by the matters that it sets up, strategically, as the objective pole in its revolutions. Indeed, the subjective pole is disqualified in the same way. It is not the question of whether everything could be understood, but that the realm of thought which is co-terminous with meaningful (and meaningless!) experience is closed on itself, in the same way as a mathematical space is closed under all available operators. An intentionality towards the outside of thought is first of all a thought. Thought bears no resemblance to the thoughts of a human thinker. The human is that subset distinguished and enabled by the split into subjective and objective poles. The two are inextricable and in tension, and go on like a bad marriage, abusing each other, imagining that they deserve an independent life, unable to admit that they only exist as a pair. I give the law to myself and then I suffer the law.