"The Shape of Shape," assembled by the New York painter Amy Sillman, working with Michelle Kuo, a curator of painting and sculpture, at the Museum of Modern Art in New York, Oct. 2, 2019. The museum's current presentation underscores the vastness of the museum’s holdings, a sight that is staggering, possibly unprecedented and probably won’t recur until its next expansion. (Winnie Au/The New York Times)