What are the characteristics of Su Shi's poems?

Su Shi's ci broke through the narrow theme of writing about men's and women's love and parting feelings, expanded the theme of ci, enriched the artistic conception of ci, and had a wide range of social contents, swept away the traditional style of ci since the late Tang Dynasty and the Five Dynasties, broke through the boundaries of poetic rhyme, and created an unrestrained school juxtaposed with the graceful school.