Ken wrote:
[ ... ]
>				 I can't think of any other way to
> have two opposing sides of a flat surface connected to each other. Looks
> like I got lucky this time.


The normals are at different corners, not the same place.
The normals are, 'by definition', coming out of the same side of the 
triangle. If they are going in opposite directions, that, I thought,
is just supposed to mean that the expected surface (not the actual
triangle
defined by the vertices) bends around that much.

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