he's work aspired to an antique, ancient appearance, and he was known to chip or otherwise artificially weather his seals to create the impression of age. he created this effect by exploiting natural fracture lines in the stone, or by emphasising the knife-marks made whilst incising the inscription. his calligraphy attempted to echo that of the han dynasty, and he used the simplicity of that script to ameliorate the elaborate stylistic flourishes of the popular yuan-style calligraphy that had previously been used for ming-era seals.