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:(adsbygoogle = window.adsbygoogle || []).push({});

http://books.google.com/books?id=EZ...=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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# Inside out universe

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