Technology
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Using the system in reverse seems like an interesting idea. I can't see why that wouldn't work either.
I suspect it might even be easier (forward vs inverse kinematics).
If you could combine both (pressure sensors and pistons) you could do force feedback input devices that can be 3D printed. Which could be useful for serious applications, like controlling a vehicle and "feeling" the road, or feeling the air pressure on the wings of a plane. Or controlling an excavator and "feeling" the earth by measuring feedback in the pneumatic pressure. Currently things like that is really expensive.