Curtain in the Sky

And soft they danced from the Polar sky and swept in primrose haze;
And swift they pranced with their silver feet, and pierced with a blinding blaze.
They danced a cotillion in the sky; they were rose and silver shod;
It was not good for the eyes of man -- 'Twas a sight for the eyes of God.

-Robert Service, The Ballad of the Northern Lights