Take a pen and write down whatever comes to your mind.

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inside out and upside down;
it's a moment to turn around,
standing somewhere in faceless crowd
where no one will catch your glance;
while you're in a mess and trying
to remember that you'll be fine,
someone's passing by just to smile
and light up the whole world at once.

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What is it? No idea.
(but it even has a rhyme)