A Lovecraftian sculptor of the 1960s and early 1970s, the Frenchman Henri Etienne-Martin.
Etienne-Martin’s entry in Dictionary of Modern Sculpture, 1960. Note the outdoor “Homage to Lovecraft”, and he also seems to have made smaller variations of this stair/throne-like sculpture.
From a 1965 exhibition catalogue in French…
From recent auction sales of his work…
“Art et mythe – La cosmogonie d’Etienne-Martin, point de depart des “Mythologies individuelles”” (open access book chapter in French).