From OpenCulture.com:
Kandinsky never heard Coltrane, but if he had, and had access to 3D rendering software, he might have made something very much like the short animation above from Israeli artist Michal Levy. “Roughly 3 per cent of people experience synaesthesia,” writes Aeon, “a neurological condition in which people have a recurring sensory overlap, such as … envisioning letters and numbers each with their own inherent colour.”