Frantisek Kupka (1871-1957)
The artwork of Frantisek Kupka follows roughly the same process of change from realism to abstract expressionism that many artists underwent around the turn of the century, with the exception that his work was heavily rooted in his practice of Theosophy and interest in esoteric symbolism and mythos. Here are a few of his paintings where you can see that:
The Black Idol (Resistance) (1903)
I see this painting as a manifestation of the feelings you encounter when working with great entities, there is a foreboding and dark atmosphere that is used to intimidate, but also the intrigue of working with mysticism and magic.
Babylon (1906)
A ritual procession towards the Hanging Gardens of Babylon is depicted with emphasis on ocean, lighting, and atmosphere.
Lines Areas Depth lll (1913-23)
Later in Kupka's journey he starts to experiment with color evocation and perception. In this painting you start to see his work with energy that the violets and light blues communicate along with the fractal repetitions.