The great Florentine bronze master, Ghiberti, had a man in the yard
behind his shop whose sole task was to polish the finished pieces.
The story goes that an old man would daily stop at the gates to the
yard and watch the polisher at his work.
After some time had gone by the old man finally spoke up and asked
this question of the polisher:
"How do you know when it is finished?"
The polisher stopped his work for a moment and said to the old man:
"It is never finished - one day they simply come and take it away."