Why is Oracle Bone Inscriptions in Joo Won? called "micro-carving calligraphy"?

Oracle Bone Inscriptions in Joo Won? is called "micro-carving calligraphy" because of its tiny font. This kind of calligraphy may be "based on the experience of the gods, not on the eyes", and the person who carved the deed, like a skillful craftsman, "is an official with Zhi Zhi's desire to do things", is connected with heaven and man with a divine deed, which makes the carved words and deeds contain some mystery.