“Ra, ” a 2018 work by Anselm Kiefer, on a hill overlooking La Ribaute, the artist’s estate in Barjac, France, Sept. 30, 2022. On his vast estate in southern France and in two new U.S. exhibitions, the German-born artist conjures a world that hovers in the penumbra between life and death. (Anselm Kiefer; Julien Mignot/The New York Times).