Madness, Hell or Knowledge
A Square: Either this is madness or it is Hell.
The Sphere: It is neither, … it is Knowledge; it is Three Dimensions: open your eye once again and try to look steadily.
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Context: A being of two dimensions gets his first sight of a third.
Not in a duel yet
Source: Part II, Section 18: How I came to Spaceland, and what I saw there