I just be reminded of Meiwa Denki. Maybe you all already knew them. But they are so awesome that I think I have to post here for you guys, just for reference.
They made a lot of instruments and toys( like knockman family toys) ... and also some funny design tools.
I guess the fallowing design from their Nonsense Toy Work shop is very useful for us in this particular time...(you can jump to the demonstration part if you don't know Japanese) :D