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As with the proposed LCRT, the Arecibo Observatory took advantage of the natural concavity of its resident crater to focus distant radio waves.

With our concavities and bulges, scars and bags, prostheses and appliances, skin sensitivities and problems handling buttons, men and women coping with cancer comprehend all too well how we look unclothed.

This concavity is mirrored at the top of the phone purely for the sake of design symmetry.

It’s that point on a curve where the sign of the curvature — the concavity — changes.

She’s emaciated; we can tell that by the concavity of her bottom shell.”