Despite their extensive damage, these Kukai era pieces are believed to be the best examples of original Mandalas that he brought to Japan from Tang Dynasty China and are highly valuable both to the history of art and the history of Buddhism.
損傷甚大ながら、空海在世時の作で、空海が唐から請来した曼荼羅原本の面影をもっともよく示すものとされ、美術史上、仏教史上に貴重な作品である。