Part of the Menil Collection, the seminal Rothko Chapel, a masterpiece of religious modern art, represents the culmination of collaboration between famed American artist Mark Rothko and his patrons, Dominique and John de Menil. Rothko's hand is obvious in every facet of the octagonal structure, as the artist was uniquely involved in all aspects of the Chapel's inception, design, and architecture. Fourteen monumental plum canvases and black-form paintings by Rothko cover every wall, commissioned by the de Menils to create a cool, quiet, meditative ecumenical space. In addition to its function as a non-denominational house of worship, the Chapel serves as a museum and a forum. Open 365 days a year at no charge, the Chapel has tackled many crucial social issues with a particular emphasis on human rights. Jonas Salk, Nelson Mandela, and the Dalai Lama are just a few of the leaders, thinkers, and heroes who have visited or lectured here.