Till now, we've attempted to highlight the intersection of story and visual design. Most video games are hybrids of these. Rez HD, however, is very light on story. Instead, Rez HD focuses on the interplay of the visual experience and the auditory. Known as synesthetic art, derived from the perceptual condition synethesia, it is the multi-sensory experience of simultaneous stimuli. In plainer English, it's the colors coordinated with sounds in Rez HD. The game itself is inspired in part by the work of Kandinsky, himself a synesthete, and takes a very narrow game formula, a rail-shooter, to an unexpected and artistically inventive new place.