I Made a Water Computer and It Works
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youtube.com
Sometimes fun but somewhat superfluous, so to say.
I would argue Andrew Adamatzky is somewhat behind, ahead and the head behind alot of this stuff.
https://en.wikipedia.org/wiki/Andrew_Adamatzky
Chemical computing:
https://en.wikipedia.org/wiki/Chemical_computer
Billiard ball computing:
https://en.wikipedia.org/wiki/Billiard-ball_computer
Slime mould computing:
https://en.wikipedia.org/wiki/Physarum_polycephalum#Situatio...