Pressing the keys agitates bacteria causing them to light up and the light travels down a fiber optic cable to cause a photocell to activate. Could be expanded to include all sorts of control systems that can't use electricity but are outside and able to absorb sunlight. Or could be expanded to use light controlled transistors to run a code. Coded bacteria transmitting different colors of luciferin to create various gates.
edit: bacteria powered screen! http://homeofthefuture.gizmodo.com/this-illuminated-artwork-is-powered-by-plant-eating-bac-1577642231/+robertsorokanich
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