sentences:  It is composed of 11,500 identically sized pieces of colored glass resembling pixels, randomly arranged by computer, which create a colorful "carpet".Since the loss of the original window in World War II, the space had been temporarily filled with plain glass.The then archbishop of the cathedral, Cardinal Joachim Meisner, who had preferred a figurative depiction of 20th-century Catholic martyrs for the window, did not attend the unveiling.