

We could use one, and assume we’re operating in the field of complex numbers:
1 N = North
i N = West
i2 N = South
i3 N = East.
And we could use the complex modulus to indicate distance or speed… or we could map the Riemann sphere onto the surface of the earth and use a single complex number to indicate location.


In the sense that the original organic material has been replaced by minerals? I guess that’s a version of the old Ship of Theseus question.