.SNIPARTnews has reported that the White House has quietly de-listed a painting by Alma W. Thomas that it chose last month, among some 45 pieces borrowed from several Washington museums, to decorate the private White House residence and the West and East Wings. Titled, “Watusi (Hard Edge)” from 1963, the work takes a Matisse collage and, as Holland Cotter wrote in The New York Times, praising the selection, “shifts the pieces around, cools the colors down, and adds a title that refers to a Chubby Checker song.” “But through copying Matisse,” Mr. Cotter added, “she began to work out a...