What about when I look at myself and with self-awareness recognise myself? Isn’t that experiencing myself as a thing in itself? The experience of my body is still indirect and mediated by physical phenomena; for example, visual experience of myself is mediated by light. If I close my eyes I still sense my body as a possession of myself, but this is dependent on sensory input from my body; I cannot know myself without such input and the point of view constructed out of it. Therefore, self-awareness is from a specific point of view, only the sensory input is internal and external; we have privileged access to inner sensations but this is from a specific point of view (our own) and never as a thing in itself; viewing must be from a point of view. It follows that we will never fully know ourselves despite our self-awareness.
Parkinson’s is a disease with a physical manifestation that overlays conscious control with stereotypical movements (e.g. tremor, blank facial expression etc). In a sense it distorts the reflection of the person beneath the symptoms to those around them; the photons of light bounce off the person at the wrong angle. The viewer of a Parkinson’s sufferer, including the sufferer herself, has to readjust, filter out the distortion, to see a clearer reflection of the person; they are not just a reflection of the disease.