[QUOTE=eg-italy]Well, if you consider points at infinity in projective geometry
, a cylinder may be considered as a cone. But an exposition of projective geometry in three-dimensional space seems a bit off-topic here, doesn't it?
Ciao
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We don't know if it's off topic or not because most of us don't have the foggiest idea what you just said!
But somehow we just inherently know it has nothing whatsoever to do with slapping a dad gum backboard!