Projection

Ryan Hirst

Theorems, Exercises, Studies related to projection and perspective. I find the subject is sometimes encumbered with arcane vocabulary. I will everywhere seek to use ordinary mathematical language rather than jargon. I hope this can be of service to others as well.


  • 1. Projection: Line of Sight on a Sphere
  • 2. Perspective Study
  • 3. Pappus' Theorem
  • 4. Pappus' Theorem 2
  • 5. 59. Desargues' Theorem (Homology)
  • 6. 60. Double Elements 2 - Rays from a Point
  • 7. 60. Double Elements 3 - Line
  • 8. 60. Double Elements 1 - Points on a Circle
  • 9. The Unit Sphere

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Projection: Line of Sight on a Sphere

In the flat image with the center O, aligned with Boxy's eye, the head of the pillar falls at Q'.
Projection: Line of Sight on a Sphere
– Ryan Hirst

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