Visualising sound: Laser and mirror and sound (youtube.com)

Tried not to alter the title too much, but it seems like HN transforms "+" into "and", which is why it looks a little confusing

Very cool! Reminds me of Jerobeam Fenderson using the XY mode in ossiloscopes to draw images with stereo sounds: https://youtu.be/rtR63-ecUNo