- Sep 28, 2018-

The shortest kind of stool called a footstool, also called foot, step under the foot, the most consistent with its original function. The Ancients are very smart, on the basis of foot design a kind of stool, called the roll Stool. There are four axes in the middle of the stool that can be rotated to massage the soles of the feet.

At that time, the scholar, while writing articles, while the feet on the top of the rub move back and forth.