The Old Library is Trinity College’s most famous. Inside the enormous building is the Book of Kells. The Berkeley Library, built in 1967 based on a design by Paul Koralek, is part of a five library complex. Its namesake is George Berkeley, a philosopher and theologian who developed theories on subjective idealism. This is the belief that physical things do not exist except as perceived by the mind. Perhaps it is fitting an equally abstract sculpture dominates Fellows Square. The giant Sphere within a Sphere was created in 1983 by Italian sculptor Arnaldo Pomodoro.