In Zen, you are instructed to 'leave no trace.'
When you clean an incense bowl,
this is not easy to do----
the soft incense powder does not readily arrange itself
when you apply too much pressure, or too little.
You must forget yourself-----
then your action becomes a beautiful action.
Beauty is revealed when the doer is unknown.
In this way, your liberation ensures
the Dharma for future generations.
-- Roshi Egyoku Nakao