Brazil Nut Effect (WITH SKYHOOKS)

Granular material of varying sizes, like sand with nuts in it, are all placed in a container the center of mass of the system is likely not at the lowest point. When the container is disturbed from shaking the larger particles like the nuts tend to be displaced towards the top so that most of the mass in the form of the smaller particles is at the bottom, placing the system in a lower energy state than before.