Piet Hein

          To Martin Gardner
"Lines that are parallel
meet at Infinity!"
Euclid repeatedly,
heatedly,
    urged
Until he died.
and so reached that vicinity:
in it he
found that the damned things
    diverged.

*Poem quoted from the book Imaginary Numbers
*Piet Hein

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don't you know that how they map the plane into the sphere, by assuming all lines "converge" to "infinity", which is a point.