Note
With an upside down box on your head and soil in your mouth, you measure the circumference.
Breakdown of circumference
mouth; opening
口
upside down box
冂 component
This clearly looks like an upside down box. Doesn't it?
soil; earth
土
Ten crops, one soil.
Usages of circumference
week
週
It takes you a week to walk around the circumference.
周
circumference
周mawari
around
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