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Originally Posted by Poppinjay
I've always thought the opposite of blue is red.
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If you don't already know, the true 'opposite' (or complement) of blue is orange. The opposite of red is green.
http://en.wikipedia.org/wiki/Complementary_color
Dualism is indeed a pervading fact of the universe--I don't think there's anything subjective about it. It's not just the human desire to categorize ideas and their opposites--it's much more intrinsic than that. To wit, here are the fundamental associations associated with the supreme science of the cosmos, physics:
significance of ones: Ones in physics are a little tentative. if you don't count anti-gravity, then gravity is a one-way force (attraction). One cosmos that we're aware of. Hopefully, there's one set of laws that describe every physical phenomena.
Significance of twos: We have particles and anti-particles, positive and negative charges and magnets. Quarks have either positive or negative spin, and one of two possible electric charges.
Significance of threes: quarks combine in triplets to form protons and neutrons. There are three dimensions, if you don't count time. Can't think of anything else.
Significance of values beyond three aren't particularly interesting. So two (dualism) is the clear winner. Every particle type has one, and only one complement--the anti-particle.