Teachers often explain electricity by comparing it to water: voltage works like pressure, current behaves like flow rate, and wires act like pipes. This analogy helps people build intuition, but it can do more than explain concepts. Engineers and creators have proven you can build real logic and computation with fluids, not just with electrons. Projects like Steve Mould’s water-powered computer and historic tools such as the Soviet “water integrator” show that fluid-based systems can perform meaningful calculations, including solving complex math problems.
Still, liquid water brings practical issues. Because water doesn’t compress, systems can suffer from pressure spikes (water hammer). Even small leaks can shut everything down and create mess and waste. That’s why many modern experiments shift toward air and soft materials, which reduce spill risks and make setups lighter and safer to prototype.
Air-Powered Computing Meets Soft Robotics
YouTuber Soiboi Soft explores this space through soft robotics and microfluidics. Instead of using water to represent digital states, he uses air pressure and vacuum to drive “soft” components made from silicone. His latest build turns that idea into something visual: a display made from inflatable “hydraulic pixels.” Each pixel uses a rigid shell topped by a flexible silicone membrane. When the system leaves the cell inactive, the membrane stays flat. When the system applies vacuum, the membrane pulls inward, forming a clear dome-like depression. In his design, vacuum = ON, and normal air pressure = OFF—a clever inversion that works well for soft pneumatic control.
Vacuum Logic Gates and a “Silicone Chip” Display
To scale from one pixel to many, he lays pixels into a grid and connects each row and column to vacuum lines. A pixel should activate only when both its row and its column receive vacuum. That requirement forces a real logic operation: an AND gate. He achieves it using two “vacuum transistors” that route suction only when both inputs are active—creating a pneumatic logic layer that resembles electronic chip design. The stacked construction even feels like a playful parallel to silicon fabrication, except here the core material is silicone—so it’s fair to call it a silicone chip.
By the end, Soiboi Soft demonstrates a working 4×4 pixel grid. He displays “Hi world!”, draws smiley faces, and imagines building simple games like Snake using fluidic logic. Beyond the novelty, this approach hints at eco-friendly engineering benefits: soft pneumatic systems can lower reliance on rigid electronics in certain environments, enable reusable modular parts, and support low-power mechanical control where full digital hardware may be unnecessary. The result is both functional and strangely calming—the gentle clicks, the hiss of valves, and the smooth pull-and-release of membranes make the whole build feel like a blend of engineering demo and ASMR.
