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Suppose you're a little creature living on a Möbius strip.
Then after "walking in a circle" (i.e. 2π radians), you will actually be upside-down.
In order to get back to where you started, you have to go around twice!
Check out my neat gif! 
pic.twitter.com/1MMvp83IWG
The Möbius strip therefore doesn't have a well defined "inward" or "outward" pointing direction.
Such surfaces are called 𝙣𝙤𝙣-𝙤𝙧𝙞𝙚𝙣𝙩𝙖𝙗𝙡𝙚
So non-orientable surfaces are surfaces in which a normal vector would flip just by moving it , or how is it exactly defined? And are there other examples of non-orientable surfaces?
It's something in which outward and inward are ill-defined. A klien bottle is another example
Are you arguing for or against a Möbius ringworld?
Neither really.. just stating a fact
BuT whAt is ITs eIGenvAlUE
In term of “endgame” how to explain this.??
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