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It's simple
Heads are differing sizes. Some people have large heads although they are short. Some tall people have small heads. It's not reliable, not standard, so why even start. It's a art school trick, an interesting thing to show artists and to discuss.
If every time we picked up a measuring tape the things varied 10-20% both ways off standard we would not trust them. We would find a better way to measure.
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Threaded Mode
