Two axes, two logics of opposition. The vertical axis measures fullness against privation; the horizontal axis balances complementary powers. Click either — or the point where they cross — to see what each means.
click an axis, a pair, or the center · the diagram highlights what you choose
The Corpus’s governing structural principle is that genuine otherness relates to the unlimited not by opposition along a single line, but at right angles to it. Two things can differ utterly from one another without standing as rivals on a shared scale — they can simply occupy different axes, each independent of the other, each answering a different question.
This page applies that principle to dualism itself. The pairs the philosophical and religious traditions hand down — light and darkness, good and evil, yin and yang, mercy and severity — are not all the same kind of opposition wearing different clothes. Sorted carefully, they fall into (at least) two distinct structures, and the two structures are perpendicular to one another.
The vertical logic is privative. One pole is fullness and source; the other is not its rival but its lack, its falling-away, its distance from the source. Nothing is gained by treating the lower pole as a positive power, because on this axis it has no positive content to give. The question this axis asks of anything is: how much being does it have?
The horizontal logic is complementary. Both poles are positive powers, mutually necessary, properly held in balance rather than resolved by ascent. Nothing is gained by ranking one pole above the other, because on this axis ranking is the wrong operation entirely. The question this axis asks of anything is: what kind of power does it exercise?
A single concept can be given an honest answer to both questions at once, and the two answers need not agree in valence, because the questions are not in competition. That is what makes the two axes genuinely perpendicular, rather than one axis described twice.
These two axes do not exhaust every form opposition can take — the Corpus does not claim that all dualism reduces to privation or complementarity alone. But the two are the most load-bearing in the Corpus’s own usage, and most classical dualisms sort cleanly into one or the other once a single question is asked of them: is the lower or opposing term a lack, or is it a partner? Light and Yin are not, on inspection, the same kind of "opposite" as one another — and once that is seen, a great deal of historical confusion about dualism resolves itself.