The Logic of Geometry

Geometry is literally the source code for reality. You start with Chapter 1,

just points and lines, basically agreeing that a ruler works. But then you hit

deductive reasoning and suddenly you are using logic to prove why the world makes sense.

It goes from simple segment addition to proving parallel lines never touch and that every single

triangle adds up to exactly 180 degrees. By the time you hit inequalities, you realize the

Triangle Inequality Theorem is just a mathematical proof that shortcuts actually work.

It is the only subject where you can prove, without a doubt, that you are right.