This one-shot is about the poster of a moth in her room. Someone capped and uploaded it; please see the story with the relevant image:
 
* https://derpibooru.org/1293781 *
 
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>You are Starlight Glimmer
>Not many ponies know this about you, but you like moths. You have a large poster of a moth in your room.
>Most ponies like butterflies, but you think moths are beautiful.
>Like the butterfly, the life cycle of the moth represents starting anew. And when the silkworm emerges from its pupa as a beautiful moth, its cocoon can be unravelled into the softest fabric in Equestria.
>But there is something unique to moths. Moths cannot navigate on their own. They navigate by transverse orientation, maintaining a constant angle relative to the moon to fly in a straight line.
>This is why moths circle artificial lights: they get confused and maintain a constant angle relative to it.
>You can’t navigate on your own either, and sometimes you’ve circled bad things because you thought they were the moon, thought they were the right thing to do.
>But friendship is the moon. Your friends help you fly straight and do the right thing.
>Most ponies like butterflies, but you think moths are beautiful.
>Maybe someday someone will find you beautiful too.
 
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For a story alluding to the other objects in her room, see "Starlight's Daddy Issues" in the main pastebin.