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Torus paradox (Posted on 2007-01-02) Difficulty: 3 of 5
A torus is a surface shaped like a donut. Imagine that I've painted two rings on a torus. One is on the outer surface, and goes through the hole in the center, coming around from the other side. The other ring is on the inner surface, and goes all the way around the hole in the center. These two rings of paint are linked.

I then cut a small hole in the torus. Through this hole, I turn the torus inside-out.

In the process, the rings of paint switch from the outer surface to the inner surface and vice versa. Therefore, they have become unlinked. How?

See The Solution Submitted by Tristan    
Rating: 4.2500 (4 votes)

Comments: ( You must be logged in to post comments.)
  Subject Author Date
InsolubleAvalonXQ2007-01-07 01:41:30
SolutionBean2007-01-06 18:16:09
Solutionre: Trying to visualise this- SPOILERSir Percivale2007-01-02 23:37:11
Trying to visualise this- SPOILERSir Percivale2007-01-02 22:17:14
re(2): solutionCharlie2007-01-02 13:34:37
Hints/Tipsre: solutionTristan2007-01-02 11:42:48
SolutionsolutionCharlie2007-01-02 08:40:00
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