This week, EMS Labs has a nifty piece on Lissajous figures which Windell was able to generate using an LED display on one of the EMS Labs’ breakout board business cards suspended from an oscillation rig built from a file folder frame, wooden dowels, and BBQ skewers.

Lissajous figures are interesting curves that occur in systems where oscillation happens in more than one direction, for example when a pendulum hanging from a string moves in its plane. The “standard” way to play with Lissajous figures is on an oscilloscope, and the easy way is of course in a web app, but there is also something to be said for a demo that you can hold in your hands. In what follows, we build a simple apparatus that takes a persistence of vision approach to displaying Lissajous figures.

A simple persistence of vision approach to Lissajous figures