RBF Definitions
"A sphere is unit, but a line is not because the terminals
of a line must represent arbitrary cut-offs. All lines,
except when abstractly considered as ‘direction,’ are some-
what curved, and all curved lines must eventually intersect–
no matter how remotely. Not even a graphed spiral is forever
possible because the errors in a graphed line constantly
dislocate the line and insist upon an ultimate intersecting
contact."
