Is this a Star Trek invention? TNG episode 6x19 Lessons features one. But it seemed to be a fake one. Air date is 04.05.1993. Seems a real one was made after the idea was featured on Star Trek, like quite a few other inventions.
I've seen these twice on music expositions.To me it is quite useless. It is flat. Black and white keys are like 2-3 mm embossed plastic. You can't depress it. The sound is horrible. It is not full length.