Colorado College’s expanded and transformed Tutt Library is America’s largest carbon-neutral academic library. The library has been transformed into a colourful, dynamic facility, accommodating the requirements of a contemporary library and the college’s unique academic programme. Designed during an era when libraries were primarily containers for books, the original building was intentionally introverted. Pfeiffer’s design of the new centre turns this introversion inside-out, to better reflect the changing use of the library and the values of Colorado College.