We are moderately obsessed at our house with building marble tracks (aka Japanese dominos). Zack started it but he needed Noah's skill to pull it off. After many, many failed attempts and gigantic messes they achieved success, and eventually cleaned up the mess. Here it is in all it's glory. (Not the clean up part, although I should video that too because that is probably an even greater accomplishment.) It goes pretty fast, these things are almost as hard to film as they are to build.
