The "Covenant", better known to the student body as "Dueling Tampons" or "The Tampons" is a large red structure, located on Locust Walk as a gateway to the high rise residences "super block", created by Alexander Liberman. It was installed in 1975 and is made of rolled sheets of milled steel. A larger-than-life white button, known as "The Button" (officially "Split Button") is a modern art sculpture designed by Swedish sculptor Claes Oldenburg (who specializes in creating oversize sculptures of everyday objects). It sits at the south entrance of Van Pelt Library and has button holes large enough for people to stand inside. Penn also has a replica of the "Love" sculpture, part of a series created by Robert Indiana. It is a painted aluminum sculpture and was installed in 1998 overlooking College Green due East of Tau Chapter of Psi Upsilon fraternity (better known as 'The Castle'). Penn took possession of (via a long term loan from Philadelphia Association for Public Art aka aPA, formerly known as Fairmount Park Art Association and installed in 2019) two multi-ton sculptures. The two works are Social Consciousness (created by Sir Jacob Epstein in 1954 and sited on walkway between Wharton's Lippincott Library and Phi Phi chapter of Alpha Chi Rho fraternity house) and Atmosphere and Environment XII (created by Louise Nevelson in 1970 and sited on Shoemaker Green between Franklin Field and Ringe Squash Courts).