Feed a sine wave into an oscilloscope's X and Y inputs and the electron beam becomes a brush—here's how to paint Lissajous figures and let an Atari 2600 draw its own sound.
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Painting with Oscilloscopes
0.500 USDCA Tektronix 2235A in X-Y mode turns two detuned oscillators into a living Lissajous figure—no rendering, no filters, just electrons on phosphor.