A because you have to go up in thirds
Chairs came into existence in various forms with addition to back support, sacral support and footstool to a normal stool.
<u>Explanation:</u>
The chairs which we use today to sit on and be comfortable were not the types how they emerged. The emergence of the chairs were in the form of stools in the first form. But then chair of different forms and sorts came into existence to increase the comfort of the human beings.
To the stools, the addition of back was done, then the sacral support was done to the chair. After some time the foot stool was also added to the chair to increase the support.
