In further evidence of changes at the Metropolitan Museum of Art under its new director, Max Hollein, the museum announced on Thursday not only its annual roof garden commission, but also the next site-specific works for the Fifth Avenue facade’s niches, which were filled for the first time last year.

For the Met’s Cantor Roof Garden, the Mexican artist Héctor Zamora has been selected to install one of his sculptures, “Lattice Detour,” made of terra cotta bricks. It will be on view from April 21 through Oct. 25.

Starting Sept. 9, the artist Carol Bove’s new sculptures — still in the design phase — will fill the facade niches through March 2021.

The move speaks not only to Mr. Hollein’s efforts to animate lesser-used areas of the Met, like the niches, but also to feature female artists and artists of color.