[MrEldritch]

> I wonder if one can arrange such conduits (6-way connected pipes and chambers) to replicate a feed forward neural network. If it can be done with light...

It actually can't be done with light, not without active switching components or very high intensities. (The "optical neural network" papers published so far are fully linear networks, lacking the nonlinear activation functions between layers that are critical for deep neural networks to have any more power than a single matrix multiply).

However, I think nonlinear acoustic properties are actually more accessible than nonlinear optical properties, and so an acoustic neural network may be more plausible.