"Do you understand the Draconian language?" The old man did not answer Jiang Fei's question directly.
"A little," Jiang Fei replied. He had put in a lot of effort in this aspect before this.
"That's good. It's difficult for me to express it clearly in human language …" The old man switched to the Draconian language to communicate with Jiang Fei.
As Jiang Fei had studied the Draconian language for a period of time, he could completely translate the old man's words into his own language and understand them.
"What do you understand about space?" The old man asked. Jiang Fei automatically translated the Draconian language into words that were easy for him to understand.
"Space? I know that we live in a three-dimensional space. Perhaps there are creatures living in a higher dimension than us, "Jiang Fei said. However, in his heart, the existence of creatures in a higher dimension was no longer a possibility because those creatures had already invaded this universe!
"By the way, senior, is the fourth dimension of the four-dimensional space time?" Jiang Fei suddenly thought of a question.
"Of course not!" The old man shook his head, then said to Jiang Fei, "Time is a special vector. There is time in one-dimensional space, there is also time in two-dimensional space. Time exists in every dimension! Time and space are two different concepts! "
"Is that so?" Jiang Fei nodded.
"Well, the relationship between time and space is explained. Now, can you tell me the relationship between the various dimensions of space?" The old man nodded, then continued to ask Jiang Fei in the Draconian language.
"Relationship?" Jiang Fei was stunned. He did not understand why the old man asked this question.
"Well, I'll explain it to you from the beginning." The old man sighed, then said to Jiang Fei, "The so-called one-dimensional space is a straight line. If there is a creature on this straight line, then in its perspective, there is only one point in front of it and one point in front of it. It can only move forward or backward."
"And the countless straight lines form a plane, the so-called two-dimensional space. The creatures in this plane are no longer limited to moving in a straight line. Instead, they can move freely up, down, left, and right." The old man continued.
"Mmm! That's true! " Jiang Fei nodded. The old man's description coincided with the knowledge he had grasped in the world of science and technology. Although the Draconic language had a different name for the Dimensional Dimension, it corresponded to each other.
"The three-dimensional world we live in is actually made up of countless planes. After layers of two-dimensional worlds are stacked together, it forms the three-dimensional world we live in." The old man looked at Jiang Fei and continued, "So you can imagine that the four-dimensional space is actually formed by countless three-dimensional spaces stacked together."
"What does the fourth dimension look like?" Jiang Fei asked curiously.
"If we want to talk about this, we have to start from our understanding of space." The old man paused for a moment before continuing, "I don't know if you've noticed, but our observation of the world is actually carried out through dimensionality reduction."
"What do you mean?" Jiang Fei was stunned.
"Give me an example." The old man waved his hand and a ray of light appeared in mid-air.
"This is a straight line, which represents a one-dimensional space. If there is a creature living here, then in its eyes, there is only a point in front and a point behind it. This means that the creature living in the one-dimensional space can only see one point." After the old man finished speaking, he waved his hand and the ray of light in mid-air disappeared. It was replaced by a wall of light.
"Look, this is a flat surface, which represents a two-dimensional space." Then, the old man waved his hand and many patterns appeared on the wall of light. There were squares and circles.
"If it is a creature living on this flat surface, from its perspective, it can't see these squares or circles. All it can see is a line facing it." After the old man finished speaking, he waved his hand again and the wall of light disappeared. It was replaced by a solid wall.
"We live in a three-dimensional world. Now, from your perspective, what is in front of you?" The old man asked Jiang Fei.
"A wall!" Jiang Fei said matter-of-factly.
"Mmm! That's right! But this is also a flat surface! You can't see what is behind the flat surface at all. Because you are a person in the three-dimensional world, you can only see the flat surface of the two-dimensional world. "The old man said.
"That's not right! I can see three-dimensional objects, such as this ball! "Jiang Fei said as he took out a ball from the Spatial Ring.
"Hehe, that's just the answer you came up with subconsciously based on a lot of relevant knowledge …" The old man said as he took the ball from Jiang Fei's hand. Then, he waved his hand and the surrounding light instantly dimmed. At this time, in Jiang Fei's eyes, only a faint round shadow of the ball was left.
"See, after losing the contrast of light, your brain can no longer calculate. The real image in your eyes is just a circle." The old man laughed.
"I see …" Jiang Fei nodded. It turned out that the three-dimensional world in his eyes was just the result of the two-dimensional image transmitted by his eyes. His brain calculated the result based on the contrast of light and dark, near big, far and small, and other knowledge.
"So, a person in a dimensional space can only perceive the space he is in by reducing the dimension. He can't see the real face of the space he is in!" The old man finally concluded.
"I see!" Jiang Fei nodded. No matter how charming the scenery in the picture was, the creatures in the two-dimensional space could only see straight lines. The colorful three-dimensional world was just a combination of pictures in the eyes of people. Although this answer made Jiang Fei a little disappointed, it was the truth.
"So, you understand now." The old man smiled and then continued, "The so-called four-dimensional space is the product of countless three-dimensional spaces stacked together. Of course, this kind of stacking is not as simple as stacking a house with bricks. That kind of stacking is still a three-dimensional world. This kind of stacking is structured in a way that we can't understand. The people there can see the essence of our two-dimensional world, like how we can see the essence of the two-dimensional world. The world in their eyes is made up of real three-dimensional images, and because we can't see the real three-dimensional world, we can't describe their world."
"Could it be that people in the three-dimensional world can't even imagine what the four-dimensional world looks like?" Jiang Fei asked.
"No!" The old man shook his head and then said, "But I found something interesting. Maybe this can help you solve some of your doubts."
"What interesting thing?" Jiang Fei immediately asked.
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