Riddle: I am a color without hue, both dark and bright; what I…

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i-can-slow-you-down-or-speed-you-up-but-im-not-time

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i-am-a-force-that-cannot-be-seen-yet-i-pull-everything

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i-am-taken-by-surprise-but-i-help-you-see-can-both

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i-have-a-twin-thats-far-from-dull-we-move-in-waves-yet

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i-can-make-you-feel-light-or-weigh-you-down-though-i-am