Think of them as metaphors, conduit metaphors, through which to frame thinking terms for talking about the concept map. Some look like train station maps, some look like apartment buildings turned on their side. Others seem to suggest build in this direction (like the “bullet” looking one: reading from the domain-first toward the resolution right-to-left, the direction the bullet points; so maybe flip it around? ¯\_(ツ)_/¯), or “chronologically”. Of course the tabular one is very nice to reason and plan about and through.