In an essay she wrote in 2016, the painter Amy Sillman described her work with color as “anthropomorphic, relational, emotional, psychological, and corporeal … In other words, let us welcome the collision of mistakes, accidents, desires, contradictions, destruction, and possible disasters that color embodies.” It’s not a bad way to think about Sillman’s art, which she has called a “physical thinking process.” At MoMA, the 64-year-old Sillman curates “The Shape of Shape,” in which she showcases 75 rarely seen works from the museum’s collection. —E.C.