The Rothko Chapel, established in 1971 in Houston, is both a sacred space and a modern art mainstay. Dedicated to non-denominational prayer and private contemplation -- and also to international peace and fellowship -- the building routinely hosts lectures, concerts, interfaith gatherings, and similar events. And at its heart, of course, are fourteen very dark, luminous, large-scale paintings by the late Mark Rothko. We speak with David Leslie, the executive director of the Rothko Chapel.