Matt Parker shows off his Magic Square party trick (unlike magicians, mathematicians often reveal their secrets). More links & stuff in full description below ↓↓↓ More Magic Square videos: http://bit.ly/MagicSquareVideos Rubik's Cube videos: http://bit.ly/rubiksvids More Matt on Numberphile: http://bit.ly/Matt_Videos A little extra bit for this video: https://www.youtube.com/watch?v=zhB2AUNcsx0 Parker Square: https://www.youtube.com/watch?v=aOT_bG-vWyg Parker Square T-Shirt: http://bit.ly/ParkerSquareTshirt Support us on Patreon: http://www.patreon.com/numberphile 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 Numberphile is supported by the Mathematical Sciences Research Institute (MSRI): http://bit.ly/MSRINumberphile Videos by Brady Haran 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: null Other merchandise: https://store.dftba.com/collections/numberphile