> Hmm...  Don't know why, but I keep seeing the lower half as one of those 
> Escher-like impossible, inside-out figures.  When I look closely I can 
> see it definitely is not, but there's something about the lighting, the 
> position or whatever that confuses my eyes.  Rotating it 90 degrees CCW 
> helps, but still...  Of course, maybe it's just me.  ;-)
> 


I see what you mean. I think it's because of the highlight along the 
inside, bottom edge where the side joins the bottom.

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