Why is oracle calligraphy's posture mainly vertical?

The vertical arrangement of Oracle Bone Inscriptions is not strictly along a vertical line, but gradually downward along the edge and texture of Oracle Bone Inscriptions. In Oracle Bone Inscriptions, we also found that Oracle Bone Inscriptions with horizontal paintings was missing. It can be inferred that the sculptors in Oracle Bone Inscriptions mainly painted vertically, and it was easy to carve healthily and smoothly along the texture of Oracle Bone Inscriptions. On the contrary, due to the limitation of carving, the line drawing of oblique circle is weakened. The organic combination of Oracle Bone Inscriptions's inscriptions and materials made oracle calligraphy's posture mainly vertical, and made full preparations for the later standardization of calligraphy.