Actually, stamps were around back then.
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Job 38:4-5 NRSVUE
[4] “Where were you when I laid the foundation of the earth? Tell me, if you have understanding. [5] Who determined its measurements—surely you know! Or who stretched the line upon it?
[14] It is changed like clay under the seal, and it is dyed like a garment.
And both Job and proverbs note that the circumference described dome is in the shape of a circle, as drawn with a compass.
Job 26:10 NRSV
[10] He has described a circle on the face of the waters, at the boundary between light and darkness.
Proverbs 8:27 NRSVUE
[27] When he established the heavens, I was there; when he drew a circle on the face of the deep,
Isaiah 40:22 NRSVUE
[22] It is he who sits above the circle of the earth, and its inhabitants are like grasshoppers, who stretches out the heavens like a curtain and spreads them like a tent to live in,
tents of course also rest on flat surfaces. Etc.
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