Marble Relay

So it turns out that marble racing is branching out into a variety of events. (The Marble-lympics that Jelle's Marble Runs does has sixteen events this year, including ten new ones, as James informs me. There are balance events, long jumps, and more.)  Here, James has set up a marble relay race with Hot Wheel tracks and Legos. :)  Some of the races are close so he records them with his iPad so that he can watch the replay in slow motion.