Many of the instabilities you see in his sims are familiar from everyday observa...

Many of the instabilities you see in his sims are familiar from everyday observation, like mixing cream into coffee. See for example, the following two which are the most familiar:

https://en.wikipedia.org/wiki/Rayleigh%E2%80%93Taylor_instab...

https://en.wikipedia.org/wiki/Kelvin%E2%80%93Helmholtz_insta...