When those 6L screw was relesed, I instantly thought it will very good for some kind of XY machine. And as I thought about that, the Pong game naturally came to my mind. After some research, there is some of lego pong machine on youtube but at least I can find is only one is pure mechanical and it has very small screen. So I decided to try making a larger version using those screw, but the first version I made almost half a year ago was a complete flop and I forgot about the theme