People born and raised in rural areas are familiar with stone mills and mills. When I was a child, people in rural areas liked to make all kinds of delicious food by themselves, and the taste of that kind of memory was unmatched by any mechanical manufacturing. For example, before making tofu, the soaked soybeans should be ground into soybean milk, and then solidified and compacted into tofu. The role of stone grinding is indispensable, but small objects contain human wisdom. And the stone mill and the mill are counterclockwise, and neither manual pushing nor livestock pulling are clockwise. Then why are the stone mill and the mill not clockwise?

The stone mill is composed of two upper and lower fans and a millstone. The textures of the upper and lower fans are just the opposite. The middle fan is driven by human or animal power with the "grinding navel" of wood as the axis. The upper fan has "grinding eyes" to add grain to the stone mill. The stone mill is composed of a millstone, a roller and a roller frame.

The mill is used for hulling, peeling and crushing grains, and it is an important daily appliance in the old days. It consists of a grinding table, a grinding plate, a grinding frame and a grinding mill.

When we use it, our left hand is in the stone mill and our right hand is outside. We often use the right hand, so the strength of the right hand is also greater. If we put the right hand outside, we will exert more force. It is much easier to push the stone mill like this. The center of gravity of the stone mill is all on the stone mill. If the right hand is inside, the closer it is, the harder it is to exert force.

What's more, our left leg mainly plays the role of support when pushing things, and our right leg mainly plays the role of pushing with force. The stone mill is developed according to this principle. Of course, the stone mill can also turn clockwise by making the texture in the opposite direction, but this clockwise right turn will be very difficult.