Hey David,
I tried exploring your last exercise every day for a while. My mind is quite unsettled at the moment so I found it quite hard to investigate for a while.
Can it be known how tall the body is?
Does the body have a weight or volume?
In the actual experience does the body have a shape or a form?
I tried out a number of ways of "measuring distance" between different points on my body using just sensations - for example trying to work out how long my spine was using the sensations from the top to the bottom of the spine. There is indeed some sense of distance between sensations within experience, but that sense is constantly fluctuating. Perhaps if my attention was more stable I could have got a better sense of it, but with my mind the way it was, it was too hard to get a consistent sense of the distance between two sensations.
There's also the obvious problem that the sense of distance is only relative to the distance between other sensations: I can only tell that the distance between two sensations in my hand is smaller than the distance between a sensation in my hand and a sensation in my elbow. I can't get any absolute distance from studying the sensations.
I tried "measuring" the volume of my torso by putting attention on both my chest and my back. That seemed to give no help at all actually, since the sense of distance between these two sensations was totally undefined. Apparently the sense of distance between sensations only works between particular pairs of sensations, or maybe if they're too far away from one another the sense of distance goes away.
Is there a boundary between the body and the clothing?
Is there a boundary between the body and the chair?
I was confused by this one, since the sensation of the clothing was being felt on the body. There are no sensations on the clothing, only sensations of the body _due to_ the weight of the clothing putting pressure on the body. Similarly for the chair. So from that point of view, there is no boundary between the body and clothing sensation-wise.
Is there an inside or an outside?
If there is an inside - the inside of what exactly?
If there is an outside - the outside of what exactly?
I tried to compare the quality of a sensations I think to be on the surface of the body (e.g. the skin of my leg) to the quality of a sensation I think to be inside the body (e.g. the muscle in my leg). When I hold them both in my attention, I can't disentangle the quality of the sensations from their proprioceptive nature - I can't switch off the feeling that "this sensation is inside and this sensation is on the surface". I can't study the quality of a sensation in isolation without my experience also containing a sense of location of that sensation in the body - a sense of how that sensation fits into the bigger picture of my body.
In terms of sensations that my proprioception labels as "outside" or "on the boundary of my body", there is no sense of inside or outside. I can't move my attention to sensations out of my body, because there are none.
What does the word/label ‘body’ ACTUALLY refer to?
What is the ACTUAL experience of the body?
Considering the experience of the body _as a whole_ is hard because I can only ever have attention some specific parts of the body. Even if I try to hold all of the chest, for example, in my attention, the sensation is always "patchy" - I can tell that there are some random parts of the chest that are missing from my experience.
My main takeaway from this exercise was that I couldn't separate the sensations in my body from the sense of where they were in the body. When I tried to zoom in a specific sensation, I couldn't tune out the sensations of the area around it and the sense of those sensations being "close" to the sensation I was trying to zoom in on. So my experience of the body is quite holistic - it can't be broken down into individual sensations, adjacent sensations seem to be intrinsically connected to each other.