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Using pairs of opposites is called Doubling.
No, they have 4 sides.
diamond and square
in the story of orpheus and eurydice, araby, a dill pickle, what conceps(binaries) suggest pairs of opposites, strong-weak, sun-moon, day-night, etc.?
Yes it does. All the four sides have an opposite. The opposites are parallel so in a parallelogram there are two pairs of parallel sides.