Work is work and there's harmony in it when the dignity it deserves is allowed to thrive naturally. The greatest teaching manual labor provides a contemplative practice is that there is no separation between work and prayer: work is prayer and prayer is work.
Look at this window: it is nothing but a hole in the wall, but because of it the whole room is full of light. So when the faculties are empty, the heart is full of light. Being full of light it becomes an influence by which others are secretly transformed.