I present you my chair design for University. We had to do (design + build) a chair, made without glue, screws or cloves.
My chair only uses 2 materials: wood and rubbers. The rubbers are the simply rubbers you can buy in a stationery or you can find them with some food, e.g. in lettuce.
Calculating what’s the resistance of one of the rubbers you can find how many tires you need to support your own weight. I needed around 500 rubbers. Gums constitute the joint between the 7 wood pieces forming the chair.
It fits the person who is sited very well and has got an ergonomic shape for your back.
Hope you a great weekend!