It has not occurred to even the most cautious of them to start doubting right here at the threshold, where it is actually needed the most – even though they had vowed to themselves “de omnibus dubitandum.” But we can doubt, first, whether opposites even exist and, second, whether the popular valuations and value oppositions that have earned the metaphysicians’ seal of approval might not only be foreground appraisals. Perhaps they are merely provisional perspectives, perhaps they are not even viewed head-on; perhaps they are even viewed from below, like a frog-perspective, to borrow an expression that painters will recognize.