Alexander Scriabin and Artificial Synesthesia

This is related:
A Midcentury Composer’s Luminous Rainbow Wheels Representing Music Through Color

Russian composer Ivan Wyschnegradsky was a 20th-century avant-garde pianist devoted to “creating a work capable of awakening in every man the slumbering forces of cosmic consciousness,” according to his journal. To achieve this mystical ideal, he set out to create sounds that no one had ever heard before. His music was microtonal, a style that transcends the limitations of the 12-scale tuning system in traditional Western music.

In the late 1940s, he translated his “ultrachromatic” compositions into these mesmerizing rainbow color wheels. He applied the concepts of synesthesia, blurring the line between sound and color. Each cell on these drawings corresponds to a different semitone in his complex musical sequences. If you look closely enough, you can follow the spirals as if it were a melody and “listen” to the scores they represent.

Also:
http://www.ivan-wyschnegradsky.fr/en/biography/

Ivan Wyschnegradsky (1893-1979) is typically acknowledged as a microtonal composer who spent most of his creative life in Paris and Germany developing his theories and "ultrachromatic scales." Before his emigration to Paris in 1920, he studied composition at the St. Petersburg Conservatory and became an avant-garde composer. Wyschnegradsky was clearly a disciple of Scriabin's music. He actually experienced something like an epiphany after hearing Scriabin's works and thereafter became a mystic, abandoned his Wagnerian approach to music, and emulated the "scriabinesque." His early orchestral work "The Journey of Existence" owes much to Scriabin's "Poem of Ecstasy". However, he was more interested in pursuing quarter-tone composition and even had Scriabin-like visions that this kind of music would push mankind to the next step in evolution. Composers like Messiaen and Boulez appreciated and performed his microtonal music, but there is virtually no interest in Wyschnegradsky today.

Related: Tone-Deafness Test and Microtonal Music