Mr. Morgan's Library The Library is by far the largest and grandest of the rooms in the McKim building. This room, with its triple tiers of bookcases fashioned of bronze and inlaid Circassian walnut, originally housed most of Pierpont Morgan's books. Above the fireplace is a sixteenth-century Brussels tapestry. Harry Siddons Mowbray's ceiling paintings feature portraits of great men of the past alternating with female muses and signs of the zodiac.