Well, my first thought is, if you must experience an opposite before you can know something, can someone discover what it is like to be hungry, by eating a tray of bigmacs?
Or, to be facetious, what is the opposite of pencilcase?
To be less facetious, what is the opposite of electricity? No electricity?
On emotions, what is the opposite of curiosity, jealousy or friendship?
And I'm not sure I accept that brown is the opposite of blue - we have red, green and blue receptors in our eyes. Blue will excite the blue receptors, while brown will excite the red and green ones. This means we have to accept a 'context' in which something is the opposite of something else (in the way that we have to see blue as being the prescence of blue light, but not red or green, while brown is the presence of red and green light, without any blue - not to mention forgetting ranges of the electromagnetic spectrum that our eyes are unable to register - i.e. the context allows a duality to exist)
Does this open up the idea further? - by which I mean, can this contextual road be dualised? Is it something that creates the dualism, or is it something created by the dualism?
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