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On the afternoon of April 22, 1915, following a heavy artillery bombardment, French Algerian troops noticed a strange grayish green cloud drifting toward them from the German lines.

But at this year’s event in early April, some browsers may have been unprepared for a small, grayish item on view: a book bound in human skin.

Adult scale insects form a grayish to dark brown protective covering called a test that resembles an oyster or mussel shell.

“The color of the sky goes from bluish, grayish to black,” he said.

He hung elegant, transparent grayish fabric drapes on which modest scenic projections occasionally appeared along with supertitles.