Difficult

In the evening I'm long, in the morning I'm small; When seen in a ballroom, I'm nothing at all.

related riddles

Through its wounds, water does run. It once held many but now has none. What is it?

Crooked as a rainbow, and slick as a plate, Ten thousand horses can't pull it straight.

Put into a pit, locked beneath a grate, guarded through the night, yet it still goes out.