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What are the oddest possible mediums you can think of for an esoteric language? One idea I had recently was the possibility of making the interpreter recieved data from a webcam somehow, and detect drastic changes in light. You could make a program like MisterHouse turn on and off the lights (or get a glow-in-the-dark stopwatch or something), and the intervals could be interpreted as commands. For an example, <1s could be + in brainfuck, 1-2s could be -, 2-3s could be . and so on and so on.
Does anyone else have any horribly inefficient, awkward, and/or clumsy mediums?
Pendulum, gyroscope and springs, all calibrated to detect the amount of gravity where you are. To change the program, change the gravity.
Haha, those are pretty good!
One way could be to check the user's pulse and give that value as input. To give different input, change your heart rate.