Most convenient structure for nature is to spin out a circle. The spherical planets, stars, galaxies, and tubular-cylindrical body cells, and the beautiful circular pot-holes .. the list is end less. What makes these forms prominent? Two things comes to mind: one is fluid dynamics which forms the pebble, pot-holes, to certain extend the moon and the planets. Second means is the central attraction force. This is the force that bring the atoms into spherical, a planet, star also as spherical.
My wife pointed out a natural square structure. When the body cells are tightly placed in a tissue or somewhere, they tend to form cubical and called cubic cells. There are rare incidents of such sharp shapes. Other area I could think of is, the cliffs and edges formed in mountain ranges when the mountains torn off due to violent quakes or other means.
When it comes to artificial shapes, man made structures are predominantly squares. The house we live, the computer screen, newspaper, this blog template .. goes on. The circular pattern is adapted either out of absolute necessity (wheel, motor coil) or for aesthetic reason (like a big arch in the hall, curvy furniture,)
Looks like it is easy for human to work with squares than circles. There are exception to this rule, like home made dosa :-)
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