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Visualization of Mercator distortion
(feddit.de)
This is a 5000km circle centered around Paris.
Found here: https://m.facebook.com/photo.php?fbid=924622615693114&id=100044361527327&set=a.610868297068549
We have Tissot's indicatrix to display this kind of distortion, much more universally usable than this random circle. Check wikipedia for examples, scroll down: https://en.wikipedia.org/wiki/Tissot%27s_indicatrix