“And what may be the nature of the Figure which I am to shape out by this motion which you are pleased to denote by the word ‘upward’? I presume it is describable in the language of Flatland.”

Sphere. Oh, certainly. It is all plain and simple, and in strict accordance with Analogy⁠—only, by the way, you must not speak of the result as being a Figure, but as a Solid. But I will describe it to you. Or rather not I, but Analogy.

We began with a single Point, which of course⁠—being itself a Point⁠—has only one terminal Point.

One Point produces a Line with two terminal Points.

One Line produces a Square with four terminal Points.