A few weeks ago someone raised my attention to this masterpiece, also highlighted at Tinkernology (a blog for LEGO Robotics and Mechanical Engineering, by Shep).
This is one of those rare videos which I get tempted to post here, with auto and continuous play features switched on. ...won't do it, because some of you would send me e-mail complaining about the noise.
It looks like a complex GBC display, but integrated into one single module and off course not using balls, but small discs instead.
This is one of many similar videos from superbird28, at his YouTube channel. Most of them seem to be preliminary tests or early versions from this contraption. They all worth to see though!
Also it seems there is something new, on its way to grow into a larger project...
Looking forward to see more!