Riddle: I'm the silent twin of joy, shadowed when light…

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i-can-dance-with-joy-or-sink-in-sadness-im-here-when

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im-a-treasure-you-cant-hold-a-feeling-that-cant-be-sold

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i-can-make-you-smile-or-bring-you-to-tears-hold-me

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i-change-faces-but-wear-no-mask-leave-a-mark-without-a

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what-is-felt-by-many-worn-by-few-invisible-to-the-eye