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/snip/ Two-dimensional creatures in Flatland can
exhibit handedness, so "the 3rd co-ordinate" can't be the general
definition of what determines handedness.
Ahh, yes. A right-handed vortex in flatland is different from
a left-handed vortex, and there is no "continuous" transformation from
one to the other. Also, there is no way for a Flatlander in one Flatland to
tell a Flatlander in a different Flatland which way a vortex is rotating!
Regards,
Jack