This has to be so insanely expensive… I assume there are a ton of small machined or 3d printed channels or something to accomplish that?
Also how do they manage to have different notes play in sequence? A single chord shouldn’t be too difficult but changing notes seems like it’d be very complicated without tiny valves or something…
Zooming in the tank says “liquid nitrogen” though… I mean, it could probably store other liquids, but that seems to be what it was built for.