More links & stuff in full description below ↓↓↓
Professor Roger Bowley works at the University of Nottingham. His drawing of the magic square can be seen at: http://www.flickr.com/photos/numberphile/6477417809
About brown paper: http://periodicvideos.blogspot.com/2012/02/brown-paper-question.html
NUMBERPHILE
Website: http://www.numberphile.com/
Numberphile on Facebook: http://www.facebook.com/numberphile
Numberphile tweets: https://twitter.com/numberphile
Subscribe: http://bit.ly/Numberphile_Sub
Videos by Brady Haran
Patreon: http://www.patreon.com/numberphile
Brady’s videos subreddit: http://www.reddit.com/r/BradyHaran/
Brady’s latest videos across all channels: http://www.bradyharanblog.com/
Sign up for (occasional) emails: http://eepurl.com/YdjL9
Numberphile T-Shirts: https://teespring.com/stores/numberphile
Other merchandise: https://store.dftba.com/collections/numberphile