[O.B.Left]

Is video available which demonstrates these points?

IMO 3D animation is really needed to show this geometry as the camera or point of view needs to move around to see the topic at hand. Luke posted some very nice screen grabs on another post called something like "Delivery Lines...what are you lookin at".

Homer must have done a lot of perspective drawings to figure this all out in his garage fifty years ago. I imagine him running between his plane board and his drafting table. I see him surrounded by contraptions and drawings moving a mirror around his plane board so he can see what going on from dtl, in front, maybe even overhead.

Anybody got any pictures of the inside of Mr Kelley's garage from the old days? His methods of discovery could be our methods of understanding. He did recommend we climb inside a plane board, I believe.

ob