Answer:
A thousand colored folds stretch toward the sky. Atop a tender strand, rising from the land, until killed by maiden's hand. Perhaps a token of love, perhaps to say goodbye.
It has no top or bottom, but it can hold flesh, bones, and blood all at the same time.
We are all around, yet to us you are half blind. Sunlight makes us invisible, and difficult to find.
It's equally comfortable in an orchestra and a geometry textbook. What is it?
What is the thing which, once poured out, cannot be gathered again?
When is it bad luck to see a black cat?