Lingbi stone is produced in the northern foot of Qingshishan, Lingbi County, Anhui Province. Lingbi stone has a natural charm, which can be divided into several kinds, such as strange stone and clear stone. It is a treasure among the strange stones in China. In his later years, Mi Fei got a precious stone. This stone is in the shape of a mountain, just enough for Mo Chi to grind ink. Miffy couldn't put it down. He slept with this lingbi stone for three consecutive nights. Even so, Miffy is still wanting more. In this starry night with sparse stars, Mi Fei splashed ink and left a famous post "Yan Mingshan", which also became a masterpiece of Mi Fei's love for stone in Shichi.