Inside out universe

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daniel_i_l
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Main Question or Discussion Point

In George Gamow's book "One Two Three Infinity" he explains on page 56 how to turn a "double apple" with a free surface into a doughnut:
http://books.google.com/books?id=EZbcwk6SkhcC&pg=PA58&lpg=PA58&dq=george+gamow+doughnut+inside-out+universe&source=bl&ots=tLVbV3XawZ&sig=OtKLoImbsOSiYiVQbaFyV1-J4Kc&hl=iw&ei=000DSq37HNirjAep_5XRBA&sa=X&oi=book_result&ct=result&resnum=2#PPA57,M1
He then (page 58) goes on to explain how the reverse process can be used to make an "inverse universe" where a human is somehow tured inside out.
I'm pretty sure that I understand how the double apple is changed to a doughnut but I don't understand how the reverse process make an inverse universe. It seems as if we just have to change the material of the doughnut itself and not the surrounding space.
Thanks.
 
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  • #2
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Have a look at the surface he demarcates "FREE". What is it bounding in each step? :)
 

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