UPJOKE
convexdishedrecessedconcavo-concaveconcavo-convexcotyloidcotyloidalcupulatedish-shapedbiconcaveplanoconcaveacetabularpouch-shapedsaclikeumbilicate

The government just built an underground prison. They call it Concave.

It's full of convex.
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My friend betrayed me on the test when I asked him where the light rays parallel to the principle axis of a concave mirror meet

I mean, he did try to motivate me by shouting "Focus! Focus!", but that hardly helps.
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Where did they put criminal geometrists?

The concave.
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Where did fraudulent stone age people conduct business?

The concave.
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