In the same way there is a single ever changing flow of sensation, is there a single ever flowing sense of immediacy, of This?
The sensation itself is at the forefront of DE. After much looking, there certainly is immediacy, in that there’s only what’s currently happening. Your question once again forced me to really look, because it subtly suggested that a “sense of immediacy” might be comparable to the flow of sensation in This. But, as with a self, I couldn’t find anything that could be pointed to as “immediacy” in DE. It’s more that immediacy just is, and is only noticed in contrast to thoughts of past or future.
But is there an experience of the ’now’ moving along the line of time?
Ah! I hadn’t read ahead, and this question gets at what I was saying above. No, there’s no experience of movement through time.
Any experience of one ‘moment’ giving way to the next?
No, there are no distinct “moments,” which would need to be arbitrarily defined by thought, aka imagined.
Is there any actual or direct experience of one event following another?
No. Without mind labels, the flow of This isn’t broken up into imagined “events.” This is seen clearly during the simple “hand on table” exercise with the flow of sensation, but not so much when engaged with the world of people and activities. It’s seen in general that “events” are arbitrary and imagined, as they could be defined and divided in infinite ways, but still there isn’t a clear view of It All as one ever-changing flow.
How fast is the ‘present moment’ actually moving?
Again referring to what's seen during the "hand on table" exercise: In This, there are no separate moments, not even a “present” one, so none can be seen moving at any speed.
Just look at 'this moment', can you find a point where it began? How long does the ‘now’ last? Where does the ‘now’ start, and where does it end?
“This moment” is seen to be a mind concept that requires imaginary boundaries. The same goes for “the now” when this refers to something distinct from an imagined "then." There are no boundaries of starting or ending points to be found in DE.
short tangent: This was a sticking point when I worked for a while with recordings of Mooji's "Invitation" pointing, in which he guides listeners to something that approaches DE. But he only goes as far as saying this is experiencing one's true self. Once thoughts of past and future are set aside and attention is just here with "is-ness," he asks questions like "Was it born?" and "Can it die?" The seekers in the recordings always answer a clear "no" to both, but it always really bugged me that this can't be seen without imagining past or future.
When does the ‘now’ exactly become the 'past'?
These are imaginary concepts, so in that sense this can happen whenever the mind labels it so, just not in DE.
What is the ‘past’ in actual experience?
It’s entirely thought.
So is there actual experience of ‘time’ or thoughts about ‘time’?
In DE, there’s only what’s sensed, including the arising (but not content) of thoughts. Time is not sensed in DE. It only appears as a concept when boundaries are imagined, appearing to divide the DE into distinct events. Time cannot exist outside of thought because it is fundamentally a comparison of “memories.” Even to use the word "flow" in discussing DE requires forgiving the limits of language, as "flow" involves movement along some line in time.
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This investigation was a big one throughout today, and interestingly brought to sharp awareness the chest constriction sensation I'd told you has probably been here for decades. It was seen that this sensation is very strongly linked to thoughts about use of time: shame about distraction and procrastination, frustration about non-accomplishment, etc. Memory says these stories have been a major running theme from young childhood, through all levels of schooling, working life, family life, and a recent ADHD diagnosis. I'm continuing to follow your guidance for communicating with this constriction, offering it love and gratitude, and telling it that it can move on.