german francais
A millstone and the human heart are driven ever round,
If they have nothing to grind, they must themselves be ground.

A set of millstones

The miller empties the bags of grain into the hopper above the millstones. The grain runs slowly into the "eye of the stone" of the upper revolving stone along the "shaking shoe" (which gives the characteristic noise imitated in the "klippklapp" of the folksong "Es klappert die Muehle am rauschenden Bach").

The first two sets of millstones produce either food flour for cattle or stone-ground meal for human consumption which still contains all particles from fine flour to bran.