A calligrapher whose words are as tall and straight as a peak and as clear as a stream? Whose handwriting is as big as the sea? Whose handwriting is as slippery as grease?

The four masters of regular script refer to Ou Yangxun in the early Tang Dynasty, Yan Zhenqing in the prosperous Tang Dynasty, Liu Gongquan in the late Tang Dynasty and Zhao Mengfu in the Yuan Dynasty.

Liu Gongquan's handwriting is as tall and straight as a mountain peak.

Ou Yangxun's handwriting is as clear as a stream.

Yan Zhenqing's handwriting is vast.

Zhao Mengfu's handwriting is as warm as grease.