▁and ▁whether ▁it ▁is ▁based ▁on ▁an ▁earlier ▁work ▁by ▁Gu ▁Ka iz hi ▁or ▁not . ▁ ▁The ▁pre val ent ▁opinion ▁until ▁recently ▁has ▁been ▁that ▁the ▁painting ▁was ▁a ▁copy ▁of ▁a ▁Gu ▁Ka iz hi ▁painting ▁produced ▁during ▁the ▁S ui ▁D ynast y ▁( 5 8 1 – 6 1 8 ) ▁or ▁early ▁Tang ▁D ynast y . ▁ ▁A ▁supp orter ▁of ▁this ▁point ▁of ▁view ▁is ▁Chen ▁Pa o - chen ▁of ▁National ▁Taiwan ▁University , ▁who ▁bel ieves ▁that ▁the ▁original ▁painting ▁must ▁have ▁been ▁painted ▁prior ▁to ▁ 4 8 4 ▁as ▁she ▁thinks ▁that ▁the ▁scene ▁of ▁Lady ▁Ban ▁on ▁the ▁lac quer ▁screen ▁from ▁the ▁tomb ▁of ▁S ima ▁Jin long ▁( d ied ▁ 4 8 4 ) ▁must ▁have ▁been ▁model led ▁on ▁the ▁same ▁scene ▁on ▁the ▁original ▁Ad mon itions ▁Scroll ; ▁but ▁on ▁the ▁basis ▁of ▁what ▁she ▁sees ▁as ▁copy ist ' s ▁errors ▁in ▁the ▁details ▁of ▁the ▁British ▁Museum ▁scroll , ▁she ▁con cludes ▁that ▁the ▁ext ant ▁painting ▁is ▁a ▁Tang ▁D ynast y ▁copy ▁of ▁an ▁earlier ▁work , ▁probably ▁by ▁Gu ▁Ka iz hi . ▁ ▁On ▁the ▁other ▁hand , ▁an ▁increasing ▁number ▁of ▁exper ts ▁have ▁rejected ▁the ▁supposed ▁copy ist ' s ▁errors , ▁and ▁see ▁the ▁painting ▁as ▁a ▁product ▁of ▁the ▁preceding ▁Southern ▁and ▁Northern ▁D ynast ies ▁period ▁( 4 2 0 – 5 8 9 ). ▁ ▁One ▁often ▁mentioned ▁example ▁of ▁a