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How level is "level" to the naked human eye? (lemmy.ml)

submitted 4 days ago by monovergent@lemmy.ml to c/asklemmy@lemmy.ml

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I was putting up some wall decorations earlier today and was painstakingly realigning everything until it looked level to my eyes. It might be just a hair off, but if I don't correct it, I'll see the misalignment almost instantly and get bothered for the rest of time until I fix it. Has anyone investigated, or is there literature on the minimum perceptible angle from level to the naked eye?

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[–] sxan@midwest.social 1 points 3 days ago* (last edited 3 days ago) (1 children)

The Earth is curved.

At least, I assume that's what they meant.

[–] SpaceNoodle@lemmy.world 2 points 3 days ago (1 children)

Oh, you're one of those round-Earth nutjobs?

[–] sxan@midwest.social 2 points 3 days ago

Ha! No, what whackjobs those people are. No, clearly the Earth is donut-shaped. This is obvious, because the Bible says so. The lizard people are suppressing the information, except on the internet. And talk radio. And tabloids.

Donut shaped!