The latest part of Transworld's 'Riddles in Mathematics' to hit the web comes courtesy of Frenchman, Magenta rider and avid flatspotter Leo Valls. Ably backed up by various Magenta heads passing through his section, Leo surfs the cosmic crust from Bordeaux to the US via various powerslides across the globe.

Filmed and edited by Chris Thiessen. You can get hold of the video in full via Itunes to get stuck into full sections from Yaje Popson, Ben Gore, Leo Valls and Bobby Dekeyzer, as well as shared parts from Bobby Worrest and Stevie Perez.