from the yt description:

A Galton board, also known as a bean machine, quincunx or Galton box, was developed by Sir Francis Galton in the 1800 to demonstrate the central limit theorem.
In reality, this machine doesn’t exist. This video is a computer simulation of a “Galton board” with Blender, an open-source 3D computer graphics software.
Firstly, simulation was run with all white balls. When the objects all settled, they assigned each ball a color and ran the program again.