ALEX DANCHEV, WITH SARAH WHITFIELD. New York, New York: Pantheon, 2021. 480 pages.“RENÉ MAGRITTE is the single most significant purveyor of images to the modern world.” Such is the bold claim that launches Alex Danchev’s biography of the painter. Danchev, who died before completing the volume, goes on to name Magritte’s many collectors and admirers, a list that includes Jeff Koons, Yoko Ono, Paul McCartney, and John Berger, as well as highlighting his role in bringing “the frisson of the surreal to Madison Avenue.” It is a small irony, then, that the work of an artist who, early in his career,