More hexagons in nature: Image: "Hexagonal formations on the surface of the Salar de Uyuni (Bolivia, 3,656 meters above sea level) [0] as a result of salt crys

More hexagons in nature: Image: "Hexagonal formations on the surface of the Salar de Uyuni (Bolivia, 3,656 meters above sea level) [0] as a result of salt crystallization from evaporating water": https://en.wikipedia.org/wiki/Salar_de_Uyuni#/media/File:Salar_Uyuni_au01.jpg https://en.wikipedia.org/wiki/Salar_de_Uyuni#/media/File:Sal... "During the rainy season (December to March) the salt flat gets covered with a layer of water. As the water evaporates under largely still conditions, the salt forms hexagonal shapes (optimal for heat transfer) on its surface known as Bénard cells, an example of the Rayleigh–Bénard convection [1] phenomena." [2] [0] https://en.wikipedia.org/wiki/Salar_de_Uyuni https://en.wikipedia.org/wiki/Salar_de_Uyuni [1] https://en.wikipedia.org/wiki/Rayleigh%E2%80%93B%C3%A9nard_convection https://en.wikipedia.org/wiki/Rayleigh%E2%80%93B%C3%A9nard_c... [2] https://commons.wikimedia.org/wiki/File:20170809_Bolivia_1581_Uyuni_sRGB_(26204506689).jpg https://commons.wikimedia.org/wiki/File:20170809_Bolivia_158...