Commissioned to make murals for the Four Seasons, the tony restaurant in the Seagram Building, Mark Rothko eventually made 30, even though space would only be able to hold seven. After a trip to Europe in 1959, which included a visit to Cornwall where he met a number of abstract artists—Peter Lanyon, Alan Davie, Paul Feiler, and Terry Frost—Rothko decided that a restaurant was not the right place for these artworks. He donated the murals to several galleries; nine came to the Tate collection. This current exhibition includes five of the looming “windowed” works in shades of crimson, oxblood, raw pink, and black, as well as paintings by the artists Rothko met in Cornwall. —Laura Jacobs