Reincarnated as an Energy with a System

<Imagine a 2 Dimensional equivalent of a Myroptoid, also known as a Circle in a universe.>

<That circle will have two sections to it. One is everything inside the circle and one is everything outside.>

<The circle and everything inside represents the Realm of Matter, and everything outside is the Realm of Energy and Souls.>

"Okay," Ning said, patiently listening to the explanation of the system.

<The line of the circle itself is one dimensional as it had no width to it, but in overall it is two dimensional. Now, imagine a human of one dimension on the circle's line>

<To that one-dimensional human, the world around him would look one-dimensional as well. To him, there is a way to go front and a way to go back. To him, it looks like a regular world that can't go forever, as nothing can go on forever.>

<however, what this human doesn't realize is that because it is a 2-dimensional object, it can go on forever as it would be looping back itself. This means the human wouldn't ever be in an infinite world, but to him, it would appear so.>

Ning frowned a little. He could see what the system was trying to say. Before he could ask something, the system continued. 

<Now, take everything and push it up a dimension>

<You now have a 3-dimensional Myroptoid or a Sphere that is hollow on the inside, like a bubble.>

<Inside the sphere, on the surface of the sphere's wall now lives a 2 Dimensional human.>

<To this human, his world is on two dimensions as he can never truly see into the 3rd dimension. If he could, he could just look up and see that the other side of his world was always visible to him.>

<To the 2-Dimensional human, his world is 2 dimensional and he can only ever move in two dimensions. At that point, the inside of a surface becomes a 2 Dimensional world that never ends>

<No matter how hard the human tries, he will never find the edge of his universe and will always think that it is infinite. With the 2-dimensional galaxies moving around forever, he will also believe that the universe is constantly growing>

"When in fact the sphere is already as large as it can be," Ning said.

<Yes. Not only that but when the 2 Dimensional human also searches for the edge of the universe, he will never find it at all, since nothing will ever crash onto it>

"He's already living on the side part of the surface of the universe," Ning said, his eyes growing slightly wide as he started understanding what the system was trying to say.

<Now, we increase the dimensions by 1 more dimension.>

"We have a Myroptoid, with me a 3 Dimensional human living on the inner surface of it," Ning said. "I perceive the world in 3 Dimensions, but what it truly is is a 4-dimensional universe."

<yes. And no matter how far you travel, you will always be at the center of your perceivable universe as what you are perceiving is wrong from the very start>

"Right…" Ning said, feeling a little shocked about it all. He knew he had questions, but it took some time to formulate them. He tried imagining the 4D Myroptoid, but his mind simply wasn't capable of it.

"Can you tell me what a Myroptoid is supposed to look like?" Ning asked. "I can't imagine the fourth dimension at all."

<Absolutely>

A small piece of knowledge appeared in Ning's head and he viewed it. As he did, his face changed to a bizarre one.

"What… am I looking at?" he couldn't help but ask.

<A Myroptoid>

"Yeah, but… what am I looking at? I can't see any visible shape at all," he said. It was something so weird and new that he didn't even understand the piece of information he had just bought.

The bizarre shape took his attention away for a while before he thought of another question to ask.

"My inner world. Is it this shape as well?" he asked.

<No. Your Inner World is a Sphere, but with the property of a Myroptoid added to it to appear like a universe>

"Hmm? What property?" he asked.

<The property for something that arrived at the boundary to loop back onto itself.>

"Loop… back?" Ning thought for a moment in surprise. "Is that why it loops back?"

In his inner world, when one kept flying to the edge of the size of the world, one would find themselves suddenly turned around, coming back from the other direction.

He was never certain why it worked, and System had only told him that it was how it worked. Today, he finally received the answer.

"Wait," he paused as one last thing didn't make sense. "If things loop back in my inner world, then… shouldn't light loopback as well? How come I don't see the sun in the night sky, glowing bright like stars."

<If it were a normal universe, you might have. But as your inner world is nothing but a replica of the real universe, the boundary of the sphere is something that light can travel to in all directions and not just the fourth>

"Huh?" he exclaimed at the sudden knowledge. "Wait, light travels in the fourth dimension as well?"

<As Mentioned before, Space, Time, Energy, and Soul can all move through the fourth dimension>

"What does that have to do with light?" Ning asked curiously.

<Because Light is a form of Energy as well, so it is capable of going into the fourth dimension to escape out of the Realm of Matter>

"And the boundary allows for all light and space to leave it?" he asked.

<Light indeed passes through the boundary of your inner world, just like it passes the boundaries of the real universe.>

<So, you do not see the sunlight loop back onto Earth from many directions like stars in the night. That is the main reason why the Inner worlds were made Spherical and not Myroptoid>