Passage: Working in a wide range of media, Xu creates installations that question the idea of communicating meaning through language, demonstrating how both meanings and written words can be easily manipulated. He received a MacArthur Foundation grant in July 1999, presented to him for "originality, creativity, self-direction, and capacity to contribute importantly to society, particularly in printmaking and calligraphy."

Question: Why did Xu receive MacArthur Foundation grant?
for "originality, creativity, self-direction, and capacity to contribute importantly to society,