The great books are used in conjunction with literary classes in higher education courses, but are often taught in separate subcategories designed for the tone of the intended learning environment. Mortimer Adler used 500 books, out of the list of 517 books within the conglomeration of mixed titles, to teach his pupils expanded literary knowledge past that of their current generation. While Adler stuck to the original list, with a few differences to some novels, many chose to omit many of these titles in order to suit an undergraduate class semester by allowing for only 130 books, such as Torrey Honors Institute. For more thorough literary criticisms, people such as Harold Bloom have comprised lists of volumes including up to 2400 books of differing natures.(2,400 books, Harold Bloom)