Well, they said in former times, that eart would be flat.
They made indeed the experience of a bell shaped sky resting upon the earth.
Even today there are people believing in a flat earth.
Others believe in a hollow earth mentioning the experience of fluid matters in a rotating bowl.
I have also made a strange experience.
Each pair of shoes I wear a year or so is worn out not in the middle, but at the toecaps and the heels.
From there I could conclude:
The earth is not flat, but has the shape of a concave bowl...
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