Why are square shapes rare in nature? I know some rocks/minerals can be square but mostly everything is curved , is there a biological reason why it’s hard for natural objects to have straight lines?
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That’s somewhat like asking “why are rocks that are exactly 128.7 mm long so rare in nature?”
A straight line is a very specific type of line.
There’s only one way you can make a straight line.
There’s infinite ways you can make a non-straight line.
Many processes in nature are random, accidental, and/or stochastic. In these kinds of circumstances, it’s much more likely that a result won’t be a straight line.
Not the only reason, but one major reason.
Another reason is the simple fact that a square isn’t as structurally sound as other shapes. Edges / corners are zones of stress concentration, and are also the thinnest part of the body, so, for example, when it comes to rocks, even if you make a square rock, the edges will get round out rather soon due to outside forces.
Things that form under the influence of gravity (e.g. tree trunks, animal legs, …) are straight though, partly because gravity acts in a straight line always in the same direction.
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