The admonition to read the wall appears to hearken to the tradition of recording cultural and religious history on the walls of temples as suggested in the Oera Linda.Wall, wall, read wall. Atra-hasis, pay heed to my advice that you may live forever. Destroy your house, build a boat, spurn property, and save life.
Here's a link to Finkel's lecture on the topic:
https://youtu.be/s_fkpZSnz2I