Water Torture for FastLED
This is a port of Danny Havenith's water_torture
animation, which is
one of the demos for his WS2811 for tiny microcontrollers project:
https://github.com/DannyHavenith/ws2811
Video: https://www.youtube.com/watch?v=sru2fXh4r7k
This software is released under the Boost Software License v1.0.