Abstract: A grille for use as a sun screen, decorative facing, vision barrier or the like is made up of a multiplicity of modular pieces, each of which is of uniform cross section along its length and has walls having spaced-apart, parallel edges defining a base plane and a portion intermediate the edges spaced from the base plane in one direction. An edge flange extends from each edge of the walls of the piece in a direction generally perpendicular to the base plane and opposite from the said one direction, and a pair of spaced-apart slot flanges extends from the intermediate portion of the walls in the said one direction and generally perpendicular to the base plane. The slot flanges define between them a slot that opens generally away from the base plane, the slot having a width at a location nearer the base plane that is greater than its width at a location farther from the base plane.