lost the link
but when I was surfing this topic late last night, I came across something about the machine using fluids, sort of like hydrolics, but not. This was at the website of the firm that built the thing, Kokoro, but as this is also the name of an cartoon character, or some such thing, google results tend to be hard to sort through. And I didn't bookmark it. (If it uses fluids as drivers, my comparison to Bishop gets even more applicable.)
Good find on the other links, though, thanks.
UPDATE: okay, I read now it uses compressed air, not fluid. Like I said, it was late at night.😳