When acclaimed Saudi artist Abdulnasser Gharem opened his first solo show in New York City last week, it closed the circle on a story that began more than two decades ago on Sept. 11, 2001, and the wars and chaos that followed. The 49-year-old Gharem, a seminal figure in and pioneer of Saudi Arabia’s contemporary art scene, hopes his exhibition Hospitable Thoughts, at the Marc Straus Gallery through Oct. 16, will spark a “new cultural dialogue.”