A harmonograph that employs virtual pendulums to draw Lissajous curves, or related drawings of greater complexity.
https://whirlart.com
https://cifkao.github.io/tonnetz-viz/
lyonbeckers
http://tonematrix.audiotool.com/
rzldavidlee588
http://stuartmemo.com
https://nsspot.herokuapp.com/visualaudio/
ryanmopt
mquescarit
