A young man once sought out a master to teach him the Japanese tea ceremony. The master tested him by asking him to clean up a garden. The young man removed the weeds and raked the leaves until the grounds were pristine. As he reviewed his flawless work, he understood something was missing. He walked over to a cherry tree and shook it so that some flower petals fell to the ground.
By finding the beauty in imperfection, the young man showed he was ready to become a master.
Source: Hidden Potential, The sciend of achieving greater things- Adam Grant.