The Chinese characters for 凸 convex and 凹 concave are cool.
Wow. Cool did not know the combination! Yes, agreed. I thought they were not traditional at first but I believe they are!?
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They are the same in both nowadays simplified and traditional Chinese. And bumpy is actually “凹凸不平”, instead of simply “凹凸”. Fun fact: simple as they may seem like, they were two characters that most of us Chinese find hard to beautifully write bc of its different structure
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