I don't have a website for it, or even any photos (there are likely non-digital photos in a drawer at my parent's house) but I built several lego-pneumatic calculating machines in the 90s, culminating in a pneumatic rubik's cube manipulator and a couple walkers where all the movement was controlled via air-logic. I was inspired by the hydraulic systems my dad used to work on on large boats.

Basically, I'm sure there's larger lego-logic systems out there somewhere. Here, I found an interesting one [0]

[0] https://www.youtube.com/watch?v=SYi9sJkS19Q