@Olivier5,
When I refer to the yin-yang structure of the world my reference is not ontological, it's epistemological. As Fresco noted, most thinking is with reference to the poles of a dualistic perspective. Permanence and impermanence, truth and falsity, reality and illusion, etc.etc. are not
descriptive of experience itself (meditate and you'll eventually realize that); but we feel that they are good to think with.
A reason we are always in such disagreement--aside from the fact that it is fun--is that we are usually not referring to our lived experience, only to inherited models
about reality. Regarding Fresco's appreciation of Wittgenstein, I totally accept the latter's operationalism, but less his notion that, like B.L. Whorf's, that the boundaries of human language constitute the horizons of human experience. Obviously, we are always influenced by our grammar and vocabulary, but we also "think" with, often paradoxically complex, unconscious psychological forces that give rise to art and poetry that, ironically, transcends the logic of language.