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Description
three osculating circles chase each other around and around the perimeter of their mother saddle. each time one gets big, the other two get small. or do they? ("osculating circles" have the same tangent direction and the same curvature as the saddle at their contact point.)

Description
three osculating circles chase each other around and around the perimeter of their mother saddle. each time one gets big, the other two get small. or do they? ("osculating circles" have the same tangent direction and the same curvature as the saddle at their contact point.)