An endless number of mechanic androids run along their individual rail path. They go up and down, straight and around. At times, they willingly join another android's rail and run together in harmony; others fall onto someone else's rail and struggle to escape from the rightful owner. The rail sometimes breaks down and some of the runners fall down without remission, but others are able to hold on another path and resume their running. At times they join paths with other androids and at times they separate paths. The running and the possibilities are endless.