Research Blog - Sound vs light and some ideas

To more fully define my methods of creating, I am working on understanding the aspects of music and light. On a quick tangent, I found something interesting that John Cage says; that there is no difference between noise and music, it is all just sound. To apply this to the visual realm, I would say that there is no difference between, say, paint buckets spilled on a canvas and a purposely ordered painting. In both cases the aesthetic value is determined by the viewer or listener, like how one cultures music may sound like noise to another and vice versa. This idea opens my mind to broadness of possibilities for creating my music and visual work. It doesn't have to be music, and it doesn't have to be totally structured. It has got me thinking about painting a picture as I play a song on the guitar, where I would hold a brush in my picking hand the movement of my arm strumming would create strokes on the canvas. I could record the song, and then add more layers over top of it in the same way. I know this is another totally different avenue for my work, but I am very excited to try this.
So anyway, here I will attempt to relate as many visual elements to audio elements as I can

Musical element = visual element:
Key=Color
Pitch=Brightness
Timbre=Shape
Dynamics=Size (of shape/timbre or of entire piece)
Texture=Texture
Rhythm=Composition

I am having trouble defining melody and harmony. Melody and harmony are functions of pitch, which I have defined as brightness. This kind of ruins my ideas because right now a melody or harmony would be created by a combination of different colors rather than by changes in pitch/brightness. Perhaps instead of defining key as color, I should allow the color to define the melody and harmony.