I was deeply inspired by "the call of cthulhu"
"Without knowing what futurism is like, Johansen achieved something very close to it when he spoke of the city; for instead of describing any definite structure or building, he dwells only on broad impressions of vast angles and stone surfaces - surfaces too great to belong to anything right or proper for this earth, and impious with horrible images and hieroglyphs. I mention his talk about angles because it suggests something Wilcox had told me of his awful dreams. He said that the geometry of the dream-place he saw was abnormal, non-Euclidean, and loathsomely redolent of spheres and dimensions apart from ours. Now an unlettered seaman felt the same thing whilst gazing at the terrible reality. " H-P Lovecraft
I tried to represent the geometrical madness of the city, with Escher and Piranese as reference.
At the end it's doesn't look that much like R'yleh, but I think it's quite close to what I intended to do.
Comments are most welcome