I created this illustration to show the differences between several 
types of graphical projection. I then created the arrows and angle 
measurements in GeoGebra using the 2D coordinates returned by my new 
"Get_Screen_XY" macro (see the "screen.inc" thread in p.b.s-f). Finally, 
I merged all six images into a single image using the "Contact Sheet" 
tool in XnView.

Mike

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