Amid the desert of northwestern Saudi Arabia, a huge mirrored sphere reflects the surrounding lunar landscape, hundreds of terracotta pots dot the sand, and the scent of frankincense and myrrh hangs between the canyons. These are artworks, part of the third edition of Desert X AlUla. Set in a region with a deep legacy of cross-cultural exchange and home to the country’s first UNESCO World Heritage Site (Hegra), this site-responsive exhibition by California’s Desert X and the Royal Commission for AlUla, in turn, seeks to foster cultural dialogue through art. The open-air show, which sees 16 con…