Inspiring us right now: Mastaba, a proposed sculpture in the United Arab Emirates by the artist Christo. A pyramid made from 410,000 oil barrels and standing 150 meters high, it may be the largest work of art in the world. Christo—famous for wrapping the Berlin Reichstag in fabric 17 years ago and more recently erecting 7,500 saffron-colored gates in Central Park—says he started planning Mastaba in the late 70s with his wife, Jeanne-Claude, but could only begin work on it with the recent approval of Abu Dhabi’s royal family and their donation of land.