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Short answer, depends on perspective. For example surface of perfectly still lake could be considered flat, but on macro level it follows curvature of the earth. But we still use water to level our buildings, because radius of a planet is so big. On microscopic level it’s anything but flat.
Someone else mentioned spider silk danging. It’s also another great example, but the same perspective clause applies. But usually crystals and some geological features tend to have flat features.
Short answer, depends on perspective. For example surface of perfectly still lake could be considered flat, but on macro level it follows curvature of the earth. But we still use water to level our buildings, because radius of a planet is so big. On microscopic level it’s anything but flat.
Someone else mentioned spider silk danging. It’s also another great example, but the same perspective clause applies. But usually crystals and some geological features tend to have flat features.