“On Breathing,” an exhibition by Nina Barnett & Jeremy Bolen that examines respiration relative to “pressure, particulate, filtration, and flow,” opens at Johannesburg’s Adler Museum of Medicine. Its lone installation, On Breathing—Iron Lung With Blue Gums (2022, image), puts a hulking iron lung in conversation with Blue Gum Trees, mine dust, extraction residue, and radioactive bricks, contrasting the deep time of resource extraction with local atmospheric conditions.