The administrative buildings in the Baha'i World Center are also called 'the Arc', as revealed by Baha'u'llah in the Tablet of Carmel, built in the shape of an arc which include, the Seat of the Universal House of Justice, the Seat of the International Teaching Center, the International Baha'i Archives and the Center for the Study of the Sacred Texts. The fifth building, the International Bahá'í Library has yet to be built.