'Little Tree' lives in the same tent with him so that Ma Lin can conveniently teach him arithmetic and woodworking.
Woodworking is considered a technical skill for primitive people.
Ma Lin actually knows nothing about woodworking, but at least he understands arithmetic, and he can help with calculations that 'Little Tree' cannot comprehend.
For instance, to make a wooden wheel, questions arise about the size of the outer rim, how to craft it, the length of the spokes, the required dimensions of the inner cylinder with many drilled holes, and where these holes should be located. Calculating these aspects is quite challenging.
How is the wheel rim constructed?
It's not about cutting a ring out of a whole piece of wood.
It consists of multiple wooden boards with curved edges joined together.
The shape and size of these boards need to be calculated by Ma Lin, as the primitive people cannot do it themselves.
Sometimes three-dimensional geometry is also required.
