The existence that only Yuan Chenfei could see was naturally Mistra.

Only this time, its light and shadow are more and more condensed, no longer just a human figure, but with a nose and eyes, closer to a real person.

It feels like the five-cent special effect has been upgraded to a one-dollar special effect, and the effect is roughly the same as that of the third-rate network.

Mystra replied, "Your progress has pleased the gods. We found that although the evolutionary ability of the human race is weak, the ability to understand and create is very strong. So the gods also want to see where your understanding of this universe has come. ”

"I thought you were here to ban the spread. "Yuan Chen Feidao.

Mistra spread his hands: "There is no need for that, the gods never forbid the spread of any knowledge, because in the eyes of the gods, it is inferior. ”

"Understand, just as the omniscient pursues the theory of the unification of the universe, and the gods only pursue the touch. ”

Mistra replied, "You don't know what the gods are after. The revelation of the gods' restriction rules is just to make everything more in line with the existing order, but the order does not exclude accidents, such as you. There has to be some variables. For more than 10,000 years, the Apocalypse has created countless beings outside the order, seeking the ultimate embodiment of that variable. ”

Although everyone couldn't see Mystra, they could still hear his voice, and when they heard this, they were a little puzzled for a while.

"But if that's the case, then what I understand now may not have been understood by anyone before, why hasn't it been spread?" Yuan Chenfei asked.

"You can explain it, but they may not be able to understand, experience, and apply. From theory to implementation, there is a long way to go. What is not one's own is difficult to grasp after all. But if any of them can be promoted through this imparting, we will not object. Everything is arranged in the dark. ”

This statement is really metaphysical enough.

Mistra had already said, "Alright, now you can say what you think." ”

Yuan Chenfei smiled bitterly: "I really feel like I'm back in my student days now, and I feel like I'm talking about my thesis in front of a professor." ”

"I'm not going to let you graduate. Mystra replied, and said nothing, like a professor sitting there, listening intently.

Yuan Chenfei said: "Okay, since that's the case, then I'll say it." Feiyu, do you remember what I told you before? If you want to break through space, you have to understand the existence of the fourth dimension. ”

Han Feiyu nodded.

Yuan Chenfei: "Then we must first know what the fourth dimension is. ”

"Is it time?" Qu Wei asked.

"Nope. Yuan Chenfei shook his head: "It's a parallel space." ”

"Parallel space, isn't that the sixth dimension?" Xia Ning had obviously read the superstring theory.

"Are you saying that there are really countless worlds like us, and there are countless identical us?" Rouva is a parallel space understood from the comics.

Yuan Chenfei shook his head: "That's not the case. Parallel space, parallel is space, not matter in space. You, me, and us are all substances in space. ”

Yuan Chenfei took out a blank piece of paper: "Let's assume that this piece of paper is space, and there is a group of microorganisms on the paper based on the existence of the two-dimensional plane. In their field of vision, the world is flat. ”

Then Yuan Chenfei took out a stack of white paper of the same size and covered it on the first sheet.

Yuan Chenfei said: "Now you can see that with the accumulation of a large amount of white paper, the two-dimensional has been extended to three dimensions. And all these blank papers, they are all spaces, but on these papers, there are no microorganisms in the two-dimensional world. ”

Xia Ning understood: "Parallel space." What is parallel is space, not matter. ”

When countless blank sheets of paper are stacked on top of each other, those blank sheets are the parallel space of the first paper.

"That's right. It's the same from 3D to 4D. Within a four-dimensional space, all three-dimensional space is encompassed, and what is parallel is space, not matter. So parallel space exists, but there will not be another Rouwa, another Xia Ning, and another Yuan Chenfei. But conversely, there may be life in those parallel spaces as well. For example, the Elf Realm, the Flower God Realm, and the Blue Sky Realm are located in these parallel spaces. ”

Li Zhanjun was surprised: "Are you saying that all the alien races do not exist in the same universe as us, but in parallel space?"

Yuan Chenfei shook his head: "No, the parallel space is the same universe. ”

Everyone couldn't understand this.

Yuan Chenfei pointed to the stack of white papers: "This is the universe! The first thing that lives on the paper is the microbes that represent the earth. The second piece of paper lives on the microbes that represent the elven flower god clan. These microorganisms do not live on the same plane, but in the same three-dimensional space. ”

Liu Li also understood: "From the perspective of the third dimension, we are indeed still in the same universe, but from the perspective of the fourth dimension, we belong to different spaces. ”

"That's right. Yuan Chenfei finally agreed this time.

He spread out all the paper again: "For a two-dimensional creature, the world is like this. No matter what the three-dimensional form of these papers stacked on top of each other, it doesn't feel it. All it can see is all this blank paper, spread out on a two-dimensional level. ”

This time, it was Qu Wei who explained: "It's like a globe made into a map." ”

"Yes. The observable diameter of the universe is now known to be 93 billion light-years, but this is seen from a three-dimensional perspective, as if in the eyes of a two-dimensional being......" Yuan Chenfei pointed to the large amount of white paper spread out: "The world is flat, and because of it, it becomes huge. But if you look at it from a four-dimensional perspective, maybe the universe is not that big at all. ”

He put all the papers back together.

The white paper, which had occupied a large area, disappeared.

From a three-dimensional perspective, this is simply the area of an A4 sheet of paper multiplied by the thickness of the paper.

But as Yuan Chenfei said, when these papers are spread out in two dimensions, a large area can be spread.

So, the real universe is far smaller than everyone thinks? Just because human beings understand it as a map, just like a globe descending to a map, so it has formed a boundless sense of space?

In other words, all parallel spaces are viewed from the same three-dimensional perspective - the space is tiled.

Yuan Chenfei picked up another piece of paper, drew a black dot on each of the two positions on it, and then folded it in half, and the black dots coincided.

"When this piece of paper is stacked on top of each other, from our point of view, the distance between the two black dots is only 1 micron," he said. Suppose there is a two-dimensional creature on this paper, and since it cannot go to a high place, it has to go from one black dot to another, and the only way to do this is to walk all the way along the surface of the paper, until it folds the paper, and then continue to walk back along the connection point until it reaches the target position, thus completing the migration from one black dot to another. For this microorganism, the distance between the two black dots is not 1 micron, but 10 centimeters. ”

Yuan Chenfei poked at the black spot: "Break the space and connect them." ”

Qin Wei nodded: "We all understand this truth, and that's how the wormhole theory came about." ”

Qu Wei shook his head: "It's different." For a long time, the wormhole theory has been based on the thin passage of space-time, believing that it is random. As for the idea of folding space, it is even more fallacious, it is equivalent to replacing a more difficult behavior with a lower difficulty behavior. Imagine if even the space can be folded, then what else do you need to think about? The whole space is under control. But if the four-dimensional space itself is parallel space, and there is connectivity in itself, then things are simple. The entry and exit of parallel space does not need the so-called wormhole and folding at all, because it is inherently interconnected. It's just that we can't walk through, it's like two-dimensional creatures can't jump directly to the upper level. It's not a question of punching holes, it's a matter of one's own mobility. Isn't it ridiculous that a two-dimensional creature that can't even jump from paper to another wants to fold the paper space?"

Yuan Chenfei smiled: "That's right. Therefore, the three-dimensional level of spatial teleportation does not need wormholes, no wormholes, and no folding space, because space is folded, and we only need to be able to get out of the four-dimensional limitations and learn to 'jump'. The current Atlas Gate is actually a four-dimensional bridge, as if a bridge is built directly between two black dots on the paper, so that two-dimensional creatures can climb over. ”

Xia Ning also understood: "So that's why one's own breakthrough can achieve spatial teleportation." Perceiving the four dimensions and walking in parallel space, you can instantly reach the place you want to reach. ”

Yuan Chenfei added: "The premise is that there is indeed a four-dimensional interconnection at the target point. ”

Yuan Chenfei drew a black dot on one piece of paper again, and then drew a black dot on another piece of paper, one on top and one on the bottom.

He said, "Now you can see that if there are two flat black dots like this, even in three-dimensional space, there is a long distance. If a two-dimensional creature wants to 'jump' over, it also has to go through a long journey. ”

With that, everyone understands.

Four-dimensional space is not indefinitely able to cross all distances, and there are also far and near.

Let's take a two-dimensional creature as an example, and now this two-dimensional creature has to crawl through countless pages in order to get from one black dot to another.

It used to have to climb only 10 centimeters, but now it can climb several meters to reach it.

"So, the farther the three-dimensional space, the farther the four-dimensional distance may be?" Han Feiyu asked.

"Yes, but not entirely. Yuan Chenfei folded a piece of white paper again, drew a black dot at one end of the paper, and then drew another black dot on the opposite side of the fold.

He held up the paper: "As you see now, these are two black dots that do not coincide when folded in half. In three-dimensional space, the distance between the two black dots has increased from 1 micron to one centimeter. But in the eyes of two-dimensional creatures, the distance it has to crawl is shorter, because this black dot is close to the edge zone, which means that it only needs to crawl two-thirds of the distance, that is, six or seven centimeters, to reach. ”

Therefore, the distance of the three-dimensional level does not absolutely represent the distance of the two-dimensional level.

By the same token, the same should be true of four-dimensional space.

But in any case, those who are able to jump to the fourth dimension will definitely walk a much shorter distance than the third dimension.

"How do you tell the difference?" they asked.

Yuan Chenfei replied: "If you want to walk in front of a mountain, you must first be able to see it. ”

The conversation is back to the original result.

In order to be able to use the fourth dimensional parallel space for teleportation, you must first be able to perceive the existence of the whole four-dimensional, at least the four-dimensional state of this area, so that you can know how to pass it.