Ivory: With Jubilee And Circle Line

Roam in grace, there’s no frontier
There is life beyond the spheres
The long way home
Endless space
Proceed and carry on
The long way home
There is life beyond the spheres

— Blind Guardian, Life Beyond the Spheres

TODO:

• Extend PGA to CGA
• Grades represent circles, spheres, etc.
  • Lines, planes, etc. emerge when passing through infinity
• Try to remain compatible with projective definitions
  • CGA is more general, so ideally PGA would be implemented in terms of CGA (just using a subset).
  • Seems tricky given that their signatures are different…