The Harmonium plots sine waves with European style
The Harmonium is an autistic mechanical brain solely concerned with sine wave synthesis and Fourier Anlysis, built by a Dutch genius who constructed her first oscilloscope at the 14. But we can't do a better job describing the Harmonium's useless beauty than the word perfect summary of the illustrious Retro Thing: "Let's just say that this entire machine elegantly replaces a single function of a $100 graphing calculator with a few thousand dollar-euros of precision engineered metal." I never thought a device would come around that would make me wish I had a reason to plot sine waves by the mere dint of its captivating aesthetic design, but here we are.
The Harmonium [Official Site via Retro Thing via Matrixsynth]

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This is just asking for a video!
One function....it totally has two: It also plot cosine waves, they are just pi/2 radians out of phase.
It's beautiful.
When I think harmonium I think reed organ...
EUROPEAN! That's not European, it's STEAMPUNK!
Internet rule #41: "Any fully mechanical device that performs the function of an electronic device must be declared Steampunk."