Law refers to "something fixed" or "in place" (OED). It is thus concerned with regularity, predictability.

The axes define direct versus indirect sources of law. On the vertical axis, state incorporates the most positivistic laws. At the other end, charisma captures the supernatural, mystical sources of law. While the vertical axis deals with principled sources of law, the horizontal axis is concerned with the institutional sources of law, whether by a delegated authority or through rules imposed on the law making process.