The shape is both talon and ocean wave, cresting into foam and bone. It seems to move, but also to undermine the very idea of motion. It is about to turn your life into nothing but an insane dream of having once lived.
This incredible illustration of R'lyeh comes from the pencils of artist Allen Williams. You can see more of his haunting work on his website.
Below is another of his alien worlds, which he describes as a genetically engineered city that has fallen into decay, and which is giving birth to itself again.