Riemann space

[Ya Sam]

Another appeal to the Renaissance men (and women) on the list, who dig both 
sciences and humanities. I read a dozen of articles trying to get an 
approximate layman's notion of what it is and I have to confess that I don't 
get it. Is there a simple or even simplistic, but nonetheless digestible way 
to explain it using some easily perceptible images? I'm helpless with 
maths...

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