A Hole in a Hole in a Hole

Audible: http://www.audible.com/numberphile

Cliff's glassware: http://bit.ly/ACME_Klein

Extras for this video: https://youtu.be/6Qpfv5y-7WU

More videos featuring Cliff Stoll: http://bit.ly/Cliff_Videos

Cliff references A Comprehensive Introduction to Differential Geometry by Michael Spivak: http://amzn.to/2cwmdB7

Animation: Pete McPartlan

Note from Cliff:
Original ideas & suggestions from Peter Nguyen of Coker College and Danny Stoll of U/Chicago
Amazing glasswork by Tom Adams, George Chittenden, Lucas Clarke, and Xing Wei