According to a link in the MAKE magazine blog, Lego fanatics have come up with a standard module design for robotic Lego ball trails. Lego builders from all over the world are building modules. Each module handles balls at one per second and has standardized in and out points. At BrickFest 2005, all the modules will be assembled into the world's largest ball trail, called The Great Ball Contraption. Photos and video of a 10 module test assembly are available online. The originators of the idea have started a list of modules that will be present at BrickFest.