sentences:  His sanctuary is the Library, a building in Gormenghast to which he retires every night after his ceremonial duties have been discharged and in which he remains reading until the small hours of the morning.The Library is located in the shadow of the Tower of Flints, the heart of Gormenghast and a Dark Tower that comes to dominate Sepulchrave's mind.His melancholia infects the very air of the library; ‘imparting its illness on either side.’ He reads of every subject but he is drawn particularly to poetry.