Why stop there? They’re just as real as any number.

I heard it was supposed to be human body temperature, but they used horse body temperature instead because it was close to human body temperature but more… stable.

A vector space is a collection of vectors in which you can scale vectors and add vectors together such that the scaling and addition operations satisfy some nice relationships. The 2D and 3D vectors that we are used to are common examples. A less common example is polynomials. It’s hard to think of a polynomial as having a direction and a magnitude, but it’s easy to think of polynomials as elements of the vector space of polynomials.