A concave mirror at the side presents to him lovelorn longlost lugubru Booloohoom.
Bloom, having the advantage of ten seconds at the initiation and taking, from the concave surface of a spoon along the handle of which a steady flow of heat was conducted, three sips to his opponent’s one, six to two, nine to three.
There are no more uses of "concave" in the book.
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Of what use is genius, if the organ is too convex or too concave and cannot find a focal distance within the actual horizon of human life?
Emerson, Ralph Waldo -- Essays, Second Series
He touched my head, which is our tradition, but my father was worried, as I had nothing but skin, no bone to protect my brain, and my head beneath the shawl was concave.