I found that surprisingly pleasurable to watch.
Here is an interesting exercise:
In thermodynamics, there is a term called "entropy". Entropy can be understood as the degree of "chaos" or "un-orderliness". Thermodynamic's second law says that all spontaneous processes lead to an
increase in system entropy. Whenever you see a spontaneous process in the nature, I urge you to consider how the final state is more chaotic than initial state. Just as an example, consider the mixing of red lemonade in water. Even if you mix them ever so carefully, the mix eventually becomes an even pink or light red liquid. Having the two components (of the mix) separate would be less chaotic than the homogeneous mixing of the two - hence the mixing is spontaneous.
However, your video shows how something which seems to be opposite of the example. The plastic beans all came together - almost in a orderly fashion. Surely the final state was less chaotic, with all the beans together in a bundle, than the initial state where everything was just randomly placed in the water? Seemingly, yes, but if we consider the formation and breaking of bonds things get different.
Forming chemical bonds lead to a
negative entropy change, i.e. less chaos. Water molecules are strongly polar, and form so-called hydrogen bonds: interactions between the Oxygen of one molecule and the Hydrogens of another molecule (due to opposite electrical charges). The water molecules that surround the plastic beans are all part of a network of such hydrogen bonds. When the plastic beans' surfaces come together, some of these hydrogen bonds must break. Since the formation of bonds lead to less chaos, the breaking of bonds lead to more chaos. Thus, spontaneous process of hydrophobic interactions is explained from thermodynamics...albeit simplified.
However, your beans are all on the surface, resting on the water's surface tension like small bugs. Since the water area around the beans have small "indents", for lack of a better word, two beans would of course come together when the two are close enough. The Earth's gravity is affecting the beans, and it is not a "bean-bean-effect".
I'm sorry if I'm rambling, I got into a chemistry frenzy
De omnibus dubitandum, "doubt everything". If we take everything we read salt-free, we may suffer hyponatremia.