rag and bone

Those masterful images because complete
Grew in pure mind, but out of what began?
A mound of refuse or the sweepings of a street,
Old kettles, old bottles, and a broken can,
Old iron, old bones, old rags, that raving slut
Who keeps the till. Now that my ladder's gone,
I must lie down where all the ladders start
In the foul rag and bone shop of the heart.

wb yeats the circus animals' desertion