This picture is based on the underworld in Sumerian mythology. On the astral plane, this place is probably just a vast wasteland filled with the most vile of abominations ... But according to the symbology in Sumerian lore it is a murky, rank, churning sea, deep below the earth . In my picture, I basically drew it to represent the way it looked to me in a dream I had. I tried to make the water look mucky and thick as well as chaotic, which represents the forces of its inhabitants.