(Credit: Catherine Ashmore / ROH) Smothered in monochrome, Keith Warner’s 2017 production of Verdi’s “Otello” is a humorless parody of art deco design. Tar-colored towers hold its personages in a chokehold; escorting them onstage with sliding trays resembling CD player disc drives. Vertical slots in the abyss and square-shaped patterns often visible on casual sweaters sever the obscurity. In its {…}