Together action is like washing potatoes. When people wash potatoes in Korea, instead of washing them one at a time, they put them all in a tub full of water. Then someone puts a stick in the tub and pushes it up and down, up and down. This makes the potatoes rub against each other; as they bump into each other, the hard crusty dirt falls off. If you wash potatoes one at a time, it takes a long time to clean each one, and only one potato gets clean at a time. If they are all together, the potatoes clean each other.
— Mu Soeng, 365 Zen by Jean Smith, editor