Formulating definite ideas about different brushes, Li also studied the calligraphy of different artists, to determine the brush type they used.
李志仁還到處觀察書畫家的作品，細細揣摩其中筆趣，以他習字的基礎及對制筆的瞭解，為書畫家設計用來最得心應手的毛筆。