Previously, I have often heard sounds like "mishimishi" or "bakki" in my head, but in the past half year, the frequency of these sounds has increased particularly, and I have experienced them countless times in my daily life. During meditation, I have especially started to hear bone sounds more frequently.

Also, I occasionally feel a large loosening sensation in a specific part of my head, and this has been repeating. Recently, these symptoms seem to perfectly fit the metaphor of a "knot."

This "knot" is located in the center of my head, slightly towards the back and a little below. There is a sensation that this part suddenly loosens, and something that was tangled seems to be untangling. This mainly occurs in the lower half of my head, but it has spread to the neck and throat, especially the area around the Vishuddha chakra.

This "loosening" initially started in the center of my head, but then spread to the surrounding areas with a "shwa shwa" sensation. As a result, the entire lower half of my head suddenly released tension. The energy taken in from the Ajna chakra between my eyebrows is now reaching the lower half of my head, passing through the center, and flowing more easily to the throat's Vishuddha chakra.

Previously, the throat chakra felt somewhat blocked, and only half of the energy was passing through. Now, I don't feel that it is so blocked. This has expanded the route for the energy taken in from the space between my eyebrows to reach the throat and chest through the head, and it seems that the amount of energy flowing into the entire body will increase.

Although it is not completely untangled, the "knot" has loosened somewhat. Since the upper half of my head will gradually loosen as well, I think it will be resolved in time.

Initially, it simply loosens and increases the amount of energy, and then, because it has loosened, a part that was constricted in the head expands further, and it feels as if the central part of the head, which has not been able to grow so far, can expand even more.

When I say "growth of the head," it may sound strange, but perhaps, until now, the head has been shrinking due to tension, and when the tension is released and it relaxes, the head starts to move, and therefore, the various parts of the head that were stiff loosen, and the head begins to function well.

That loosening, which has been happening with a "crack" or a "creak" for about half a year, has now, in a sense, released the "knot" that has been passed down from ancient times, and with that, there is a feeling of "fluffiness," just like the feeling of comfort when a thread unravels, and the sensation of the tension actually loosening and the head expanding further.

This is what is called the "Rudra Granthi (knot of Shiva)," and if this loosening is the key to the next stage, then the loosening of the head that has been continuing for about half a year may finally be coming to an end.

In the writings of Professor Honzan, it says the following:

Ajna is located in correspondence with the end of the spinal cord, and three nadis converge there, forming something like a knot. This knot is called the Rudra Granthi or the knot of Shiva. Physically, Ajna is said to correspond to the pineal gland. (From "Esoteric Yoga," p. 160)

Even with this, the sensation of "creaking" and "cracking" inside the head continues, but at least, in a significant part of the lower half of the head, the loosening has subsided, and it feels as if, if we continue to repeat the "creaking" and "cracking" towards the upper half of the head, which is not yet completely loosened, this stage will soon be coming to an end.

At the same time, immediately after this, the degree of stillness seems to have deepened one step further. It feels as if the degree of stillness in everyday life and the depth of returning to stillness after thinking have changed, and it seems that the distinction between not thinking and the stillness that is not thinking has become clearer. It feels as if the distinction between thinking when thinking and being still when not thinking has become clear.

In other words, it is as if the surroundings have become clearer, as if the surroundings can be felt more clearly, and as if one's own movements can be felt more subtly, and as if the field of vision has been divided more finely, and smooth and subtle movements can be recognized.

At this stage, the meaning of "being full," as spoken of by spiritual and Vedanta teachings, becomes recognized as literally and directly true, in the sense that it is experienced. It is not just a matter of "understanding" as Vedanta describes, but rather it is recognized as something that is literally true, and therefore, true, like a physical law. Even in this limited space, perhaps only a few meters around, one becomes aware that their own senses are "full." Of course, this does not mean one can read other people's thoughts, nor does it offer any particular convenience. Nevertheless, the feeling of "being full" is experienced as literally and directly as it is described.

At this stage, one finally realizes that a significant part of their former self was still dormant. While this realization has occurred in stages before, one also realizes that even at this stage, a significant part of their former self was still dormant. Perhaps there are still more stages to come, but even here, one experiences a change in perception.

Previously, such a refinement of perception had occurred, but it required a certain degree of concentration. This time, it is happening more automatically. The difference is that the fundamental level of consciousness has become a step quieter, which has allowed for a deeper and more automatic level of perception.