How is Mr. Ji Xianlin's calligraphy attainments?

Fortunately, I saw one in the exhibition, with a four-foot screen that read "Elephant Invisible". From the perspective of appreciation, it is unique. After all, he is a master of Chinese studies, and his accomplishments are beyond the reach of ordinary people. Professionally, he didn't write as a calligrapher. His words reflect the inner world and rich knowledge of a master of Chinese studies, that is, people call him "bookish", but he certainly doesn't talk about composition and structure.