I've been thinking about Dune technology recently. Why didn't they just make Spice Harvesters that didn't involve rhythmic vibrations? Obviously industrial processes will always create vibrations, but do they have to be rhythmic? Stochastic Mechanical Engineering could be a major field of study at Arrakeen University.
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Whether that would be considered a computer in BJ terms is, of course, unclear. Probably not, since it doesn't have a stored program.