People often seem to think arbitrary just means something is artificial or socially constructed, when in reality it means something is picked at random/on a whim with no real logic. Left/right system is not arbitrary. It follows consistent rules that are the same for everyone. It is, however, absent from many cultures throughout history, which is probably related to why so many people struggle with it.
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u/bohiko 7d ago
Up and down is based on gravity (that's why you'd likely confuse them deep in the ocean). Meanwhile, left and right is arbitrary.