The family of Archimedean Spirals has the polar equation r = a * Theta(power(b)).
The script avoids using b=1/n, to avoid division by 0 if n=0.
b = the tightness of the Whorls.
For Archimedes' spiral, b = 1. Its inversion is the hyperbolic spiral, b=-1.
For Fermat's spiral, b = 1/2. Its inversion is the lituus, b=-1/2.
Other values of b yield different curves.
The minimum tightness is set to -1.0, because lower values hung up Moi. If b < -1, b = -1
The maximum tightness is set to +3.0.
Fermat's spiral is also known as the parabolic spiral.
The hyperbolic spiral is also known as the reciprocal spiral.
If b = 0, whorls of "circle(s)" forms. (On top of itself)
The "circle" is not quite as perfect as a Moi Nurbs circle.