Subjectivity seems to be something quite different from the physical world. For a start it is private, experiential, incredibly difficult to communicate and then only by reporting at a third person level. It must be understood as a dynamical system, fluid, chaotic.
Experience is what it does.
Experience is what I do. It is not as though I am a rider on some wave of experience, to whom its qualities are transmitted. I am that wave, experiencing. Subjectivity is essentially the first person experience of the activity of the conscious brain. In other words, it is the experience of being inside these processes of the physiological brain as described within the language of phenomenlogy.