It sifts from leaden sieves

It sifts from Leaden Sieves -
It powders all the Wood -
It fills with Alabaster Wool
The Wrinkles of the Road -

It scatters like the Birds -
Condenses like a Flock -
Like Juggler's Figures situates
Upon a baseless Arc -

It traverses yet halts -
Disperses as it stays -
Then curls itself in Capricorn -
Denying that it was -