He was educated as a musician and an architect (he never completed his architectural studies) in Buenos Aires. He worked as a school teacher. He was a sailor. He was a world traveler. And then he decided to become an artist (with watercolor his main medium - but he also dabbled in tempura and oils). He has been compared to Kandinsky, Klee and Chagall (but the painting above looks very Chagall to me).
After traveling for years, he returned to Buenos Aires in 1924 and became part of the avant-garde Florida group literary circle. He invented two fully elaborated imaginary languages, symbols from which figure in his paintings (thus the comparison to William Blake in Joe's title). Solar also had a strong interest in astrology and Buddhism.
He said of himself "I am maestro of a writing no one reads yet." (Hey, sounds kind of like my blog - we have something in common, maybe that's why I like his art so much.)