I work at an elementary school and I absolutely love this concept. My only concern is that the speed of execution is rather quick (and rather difficult to con

I work at an elementary school and I absolutely love this concept. My only concern is that the speed of execution is rather quick (and rather difficult to control since... you know... gravity). Besides very trivial examples, I think younger children will likely have a difficult time "debugging" and reasoning their way to a solution. The "stopper" piece can certainly be helpful for students to use as they slowly build out their solution, though, and so that may be sufficient. I've always had success with toys or other instructional materials that have tried to make computational logic a physical, tangible thing for students. There are plenty of toys in this category that have a physical element to it yet it is simply a by-product of the computation that is still "hidden" in software. There's a reason why Papert was so fascinated by gears. I'm incredibly excited about this and can't wait to try it out.