Heavily inspired by the demoscene of the 80s and 90s. This is a common effect seen in many demos of the time, and I think it looks really cool. The really close up, hard to read text is also a staple of many demos.
https://trasevol.dog/2018/01/24/di20/ A very helpful tutorial, originally for PICO-8 but can easily be adapted. The main maths behind the effect comes from here. Other than that, everything is mine!