John Nixon’s exhibition “Groups + Pairs 2016–2020” opened in March only to be paused due to Covid-19 restrictions. Nixon was suffering from leukemia and passed away in August at the age of seventy. As a gesture toward his legacy, his decades-long gallerist and friend, Anna Schwartz, announced that his final exhibition would remain on display for the rest of the year. A nearly yearlong show is fitting for Nixon—a radical modernist who spent more than a decade, for instance, producing orange monochromes. The extended run affords a matchless opportunity for Nixon’s significant and abiding following