They live in a weird, colorful and bright, but cruel world, where every other being tries to kill them. As a shards - parts of the decedent deity - they have no right for existing.
And they are siblings, yea
More under the cut
Personalities ~
Delirium can't talk, then uses telepathy. Doesn't show emotions, so you won't know when you've gone too far and it's time to run. Very-very tired, very-very angry.
Extremely paranoid about everything, cause normal deities want to kill him and his sister.
Folly is frivolous and doesn’t understand many things. Talks all the time about everything. Autistic? Maybe.
Sometimes she hear the voice of her “father” in her head, he orders Folly to kill them all. She slowly loses her mind.
My interpretation: Pretty simply, I imagined a nebula that looks like an open rose from a particular angle. And maybe it does exist somewhere out there in the infinite expanse of space. Who can say.