I think the term is persistence of vision. I might be wrong but some people can get by with 14fps and it can look good to them. To me it's a bit low unless there's some kind of blur. One person I know thinks 30fps is the gold standard, but I think that's a bit too much. Mainly because if you have to animate so many additional frames it takes forever. The right balance is definitely somewhere around the 20 range you picked in my opinion.

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