TENORI-ON is one of the coolest electric musical device: it is portable, easy to play and good for audio-visual performance. But I have not purchased it yet because it is expensive and a shortage in Japan. That is the reason why I made an unplugged version of TENORI-ON, or "TENORI-OFF". Materials list Acrylic board (5mm thick) Vinyl pipes (4 straights and 4 corners) Bubble wrap Silver lacquer spra