Charles Babbage fact: the What's the Difference Engine, designed during his blue period, accepts input represented by the positions of brass cogs.
On turning a crank, the machine emits a protracted sighing noise. There is no other output.
@christianp Occasionally, as I understand it, a small red notice flag pops up from the innards of the machine, bearing the message, "Life? Don't talk to me about life."
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