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orthographic
nothing!
frontal profile horizontal
All drawing is a form of projection in itself. If you mean how do you project orthographic shapes to trace then the best way would be to place a light 180 degrees behind the object you wanted to draw. This would cast a silhouette (which is essentially what an orthographic drawing is) that you can trace.
Amagine looking at a cube from an angle. Now to make that orthographic amagine looking at it straight. A cube would just be a square.