When did calligraphy become 1 art?

Calligraphy: One of the traditional arts in China. As early as the Shang and Zhou Dynasties, there were "relics". Oracle Bone Inscriptions and bronze inscriptions are the treasures with the most artistic value. Seal cutting, who has preserved extremely precious calligraphy. The inscription "remains" of the pre-Qin period in the Spring and Autumn Period and the Warring States Period also preserved the calligraphy seal cutting. After Qin and Han dynasties, paper and brush were invented one after another, which really created the era of calligraphy art. Although we can't trace back to who made paper and pens in Cai Lun in the Eastern Han Dynasty, the art of calligraphy has been in China for thousands of years.