Water IS always level.
The point is, level is not flat surface.
It follows Earth's curvature.
Like 1.4 degrees of curvature along Suez canal.
Datum line for Suez canal was curved, following globe surface.
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According to Flat model, large spheres don't exist.
Water would just fall off one.
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"Down" is for everyone where "my down" is.
Their down doesn't count.
"Down is where you turn your legs to support your weight" is ridiculous.
I know where my legs are. On the ground.