What do you mean by this? That the visual thought can LITERALLY APPEAR or BE at anywhere in experience?
Where is a bit tricky in this sense. When there is seeing this is what happens: colors then a thought making an image of the color, saying what it is isnt, saying if it it can see it clearly etc. The place thought happens thought is beyond me, a more accurate way to say is that I have not yeah found a border between "where" a thought appears and where a color appears in direct experience. When there is a sense of a line or border it is seen that it was in fact a thought.
If you are sitting in a room, then a visual thought can appear anywhere in the room? Inside the furniture, on the table, inside a cabinet, on the ceiling, etc?
Not tryna play weird spiritual semantics here lol. But "I am in a room" is a thought. If I directly look into the compenents of the room as directly experience it is just colors, then a thought pops making a "coherent" image of what those colors are. Thought can even go so far as to say that a thought just appear inside furtniture, a table, a cabinet etc. There is no evidence of a dividing line between thought and color, yet paradoxically you can clearly distinguish them in the moment, thought happens "after" a color. Thought claims to KNOW what colors are.
Is there ANY physical location where thoughts appear, including visual thoughts?
The sensations of my face do not see thought or hear them. The sensations of my head do not see thoughts or hear them. No part of my sensation/body actually hears thought or sees visual thoughts. Truly in experience thought just appear but I have not found a border between thought and the senses.
It funny because it is thought that creates location. It becomes increasingly clear when hearing. Thought maps the sound in a location, then map another sound in another location, there is a subtle mental after image describing that this sound (with its content) happened over there, that sound (with its content) happened over here. Even the location of mental talk, happened right here. All thoughts! The moment a sound appears it is gone, only way to know its location is through thought. The only way to know a thoughts's location is by believing another thought that claims to know the location of a previous one.
Some thoughts say sensations happen in an empty blank dark background, some say sound happen far away in the environment, some say that is a mental picture of a body full of sensations in a room typing on a computer right now and noticing there is no self. All thoughts.
Does experience have a field?
If by field you mean a container of experience I have not yet found one. There is only what appears, what is perceived: sights, sounds, sensations, taste, smells, colors and thoughts.
Does experience have borders?
I have not found a particular time or place where experience "begins" or "ends". I can only tell a posteriori through thought. I also believed that experience restarted after being distracted, then I am "suddenly" aware. But I can only tell I was distracted "after the fact" through thought.
What is it exactly that is feeling the sensations?
Sensations just like sound appears. There was a sense that "thought feels" but its not true. There is just sensations appearing. Thought claims to be the container and "feeler" of sensations.
And what is it that is believing in verbal or visual thoughts?
A thought claiming to believe in verbal or visual thoughts.
And what is it exactly that can hold onto an after image?
A thought cannot hold onto an after image. There is just an after image, when it is time for it to be gone its gone.
I will answer to the other questions shortly.