"I don't even have to use a finger, just imagining in my head, I can kill you."
Greim's classic quotes, and in fact, Greim did indeed perform this seemingly arrogant act. For his power is imagination, because his body is imaginary, and the brain, which is soaked in an apparatus filled with liquid, is the essence.

I think that the use of "brain in the vat" to describe this character may be more meaningful.
"Brain in a Vat" is the hypothesis expounded by Hillary Putnam in 1981 in his book Reason, Truth and History.
The specific theory is:
"A man (who can be assumed to be yourself) is operated on by an evil scientist, and his brain is cut off from the body and placed in a jar containing nutrients to keep the brain alive. The nerve endings of the brain are connected to a computer that programs messages to the brain so that he can keep everything completely normal. For him, it seems that people, objects, and the sky still exist, and their own movements and physical sensations can be input. The brain can also be input or intercepted by memory (memory of brain surgery is taken out, and then entered into various environments and daily life that it may have experienced). He could even be typed into code and 'felt' that he himself was reading an interesting and ridiculous passage of text here. ” The most basic question about this hypothesis is: "How do you guarantee that you yourself are not in this predicament?" ”
Proper Western version of Zhuang Zhou Mengdi, is it "Zhuang Zhou dreams of becoming a butterfly, or does the butterfly dream become Zhuang Zhou?" ”
Of course, we are not trying to glimpse the greatness of science, but to explore the nature of Grey's power.
When Greim disappears, the whole body is reduced to nothingness, but in fact, the function of "turning fantasies into reality" is only a canned brain. Doesn't this coincide with the image of the "brain in the vat"?
In fact, I have never understood why The author, who is good at physical combat, would arrange an opponent with "beyond the conventional ability" to him, and this is the first battle after Sword Eight recovered its strength.
Then there is only one explanation, and there is a limit to the imagination that seems to break the rationality, or that there is a limit in Grammy himself, as Kenhachi said, "Fighting with me is too desperate, and the head is not enough?" Yes, Greimer's brain, like the "brain in the jar" mentioned earlier, has a limited amount of knowledge, and the "world" and "real world" he understands are basically two concepts. Therefore, no matter how powerful Greim described "imagination", it is only the power of small human beings living in their own world.
If Greim had existed in the form of a "brain" since the very beginning, yuha had not yet given him power, his source of cognition could only rely on imagination, and his idea of "living" could only be maintained by fantasy. Or rather, he was originally a vegetative person lying in an isolated hospital bed, only the brain still had organic energy left, and his knowledge was limited to what he had learned before becoming a vegetative person, and the information he obtained from the words of others after becoming a vegetative person.
But in either case, it is doomed to be poor in the amount of knowledge and cognition of Greim, and he uses these limited amounts of information as the basis for building his own "imaginary world", so everything can be explained.
Why did he only imagine his body as hard as steel when he fought With Kenpachi, instead of directly imagining what the blade could not cut off?
Why are the defensive items created so fragile than something that can withstand hundreds of attacks or even be difficult to slash?
Why not imagine an attack that no matter how Much Sword Eight struggled, it couldn't defend itself against? Why not imagine the outcome of Kenhachi's direct loss of the battle?
Because there are no such concepts in the imaginary world based on his thin amount of knowledge, he is just an ordinary person who jumps from the "false fantasy world" to the "real world".
"Your level of imagination can't create something I can't cut." It is precisely like this that Sword Eight's comments can be described as a needle to the blood.
He can change matter and create matter, but he cannot intervene in existing facts, everything in the world has its cause and effect and law, and with Gremy's mind, he simply moves the things of the "brain world" to the real world, and as for more, he cannot do it. Even after he was empowered by Youha, the world he came into contact with was only a small branch of the vast system.
In the plot, Yaskin and Pepe Vacabrada have this conversation about Greim: "How could Your Majesty let that kind of person out?" That kind of monster should be locked up for a lifetime. ”
A possibility arose, that the power harnessed by Greymi's crazy personality, in the eyes of other destroyers, was no different from that of a monster, and would naturally be alienated, and Yuhabach may have imprisoned Greymi for this reason. These factors will make it more difficult for Gremy, who is only living in his own world, to have access to the real world.
The battle with Sword Eight may be the first battle he has done his best in his life, and it is also the opportunity for him to finally have the opportunity to touch the real world. So, he grew up in battle, and gradually began to have "emotions" in battle.
"Why do I want to crush this man so much?" For the first time, there was a desire for victory.
"Why am I so, and now I am so physically and mentally happy?" For the first time, I was delighted by the battle.
"Why can't you stop this guy's sword?" Am I really going to lose to him? How can it be! "For the first time, I experienced the fear of death.
"I want to win, for the first time in my life I want to win over someone." The need to win for the first time reached an almost obsessive point.
"Damn, I want to win." For the first time, I felt sorry for the failure.
Judging from the above examples, these emotions are indeed the first time he has experienced that in the narrow world he feels too much wonder and inconceivability. The battle with Sword Eight has prompted Greim's closed world and closed heart to slowly melt and become rich. Because this battle was a key to opening up his "narrow imaginary world", some implicit things, some theoretical things, he may have imagined, but he had not experienced it. Therefore, when he is about to die, he will show such a lonely emotion.
In fact, most of the Star Cross Knights' Exterminator Divisions were armed with their own weaknesses as a source of their own shortcomings. "A true warrior, dare to face the bleak life, dare to face the dripping blood." I think the author wants to convey such an emotion.
Let's talk about the opening words of this volume.
"Beauty is emptiness"
——Excerpt from the opening words of the Bleach manga volume 68.
(The so-called beauty is a false thing)
The things that Greim created will disappear at the moment of his death, no matter how many things Greim creates, they are all false for the real world, and once the source of imagination disappears, then the imaginary things will no longer exist. But as long as Greim continues to imagine, the imaginary will always exist forever. Isn't it beautiful that there is only one thought between "false" and "real"?
When Greymi first met Sword Eight, he said, "Oh, is this the More Wooden Sword Eight?" It seemed strong, just as I imagined. Doesn't that say weird? Could it be that Greim had anticipated that the powerful opponent he had imagined in his mind would appear? That is to say, there is such a possibility that the arrival of Sword Eight is the imagination of Gremi.
Greimah claims to be the strongest, arrogant as he will definitely choose a strong opponent that matches his own strength, looking back at the plot, his appearance is to deal with eight thousand streams and yongyin, but the combat strength of the two vice captains does not match the opponent he wants. It is hard to imagine that he would do something meaningless, that is, to shoot at Yachiryu and Yongyin in order to draw out a stronger opponent, so it makes sense.
He may have given the brain an imagination of "wanting to acquire a powerful opponent" in advance, and the brain created a set of imaginary scripts according to this demand, and according to the settings in the script, the results can be turned into reality. Dealing with the Eight Thousand Streams and Yongyin is the first link, feeling the Eight Thousand Streams attacked by the Sword Eight, will come under the guidance of imagination, otherwise why can the Road Fool's Sword Eight arrive in time, and there are no other enemies on the way.
And, when they saw Sword Eight, what was the reaction of the other team members? "I didn't even notice the spirit pressure, when did Captain Gengmu appear?"
Why is there such a reaction? I think the scene when Greim first appeared can be answered, Greim silently invaded the medical room with the open boundary, and the two Grim Reapers and one of the Exterminators who were present at the time did not realize it at all, because Greim used the power of imagination.
Following this line of thought, the sword eight who rushed to the scene, the eight thousand streams that were attacked, and the brave tone, including Gremi himself, were all under the script constructed by the imagination. The essence of imagination is "false", that is to say, as long as Sword Eight does not appear, then this set of imaginary scripts is invalid, until the moment when Sword Eight appears, it is truly realized in the real world. This explains why the soldiers did not notice the arrival of Sword Eight in advance.
Because the "Sword Eight that rushed to the road" was imagination, and the "Sword Eight that arrived" was real, the spiritual pressure of sword eight before was most likely obscured by the power of imagination.
Of course, my speculation involves causality, whether imagination can affect the cause and effect of reality, which is not explained in the plot, and it should be a personal point of view.
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