Marbles is ‘open-source’ improv; a free-and-easy solo format where anything can happen.
It usually involves chats with the audience, sometimes guest players (from seasoned veterans to innocent audience members), and always features Ryan riffing on it all through improvised stories, scenarios and characters.
Originally developed by Ryan Millar and Dave Waller as a two-man format, Marbles has always been a very open show. Based on chats with the audience, and riffs on whatever springs to mind, improv would happen, and themes and stories would emerge.
Ryan first attempted it on his own once when Dave was double-booked in spring 2012. That went really well. So did the next time. When Dave quit Marbles that summer to focus on his own projects, Ryan decided he enjoyed doing Marbles on his own so much that he continues to do so.