There are no straight lines in nature and certainly no squares or rectangles formed of them. You won't find any perfect circles, either. Ripples and rainbows and the rings of Saturn come close, but "a perfect circle is a geometrical idealization," as John Adam, mathematics professor at Old Dominion University, says. Therefore, we can imagine them, and we may even be able to create a close approximation of finite precision, but they certainly don't exist in nature.
What does exist in nature,...
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