Hush!don't open the door for him

Chapter 176 Discovery

There is indeed a scratch on the steps, which is not obvious, and you need to get close to see it.With the light of the fire in Qin Sang's hand, several people gathered around and began to study.

"How can you be sure that this is the trace I left behind?" Zhong Ziyan poked his head out from behind Qin Sang's shoulder, with a look of disbelief.

"Ability." Fang Yin pointed his index finger at his temple and explained, "My ability is about memory, and there will be no mistakes. I'm sure."

His tone was extraordinarily certain.The people here have more or less teamed up with him to pass through the illusion, and they also know that his performance in the past illusion is still reliable, and the words he speaks are very credible.

Fang Yin squatted down and stroked the scratch with two fingers together, and reconfirmed: "This is definitely the same mark. We are back again."

After looking at it for a while, Shen Qiubai said uncertainly: "I remembered. I seem to have seen this trace before. Then you suddenly appeared not long after. At that time, I was directly attracted all the attention. I forgot this detail. Hearing what he said now, I still have some impressions."

Zhao Shuyi crossed Ye Mingzhu in his palm and said, "In other words, we've been going around in circles."

No wonder this ladder seems to have no end.

"But we didn't make a turn. Isn't this a straight road? How can we go around in circles?" Qin Sang straightened up, with a puzzled expression on his face.

Shen Qiubai took a deep breath, with an inscrutable expression on his face, he clasped his palms together, and made a loud "pop", squinting his eyes and shaking his head, and deliberately lowered his voice and said: "Ah, I see. We must have met Arriving at the legendary mysterious ghost hitting the wall!"

"Tsk, don't make trouble!" Zhao Shuyi patted Shen Qiubai on the back, like a parent teaching a bad boy.She is also quite helpless, this guy is not in shape when he is so serious.After Zhao Shuyi received Shen Qiubai's aggrieved eyes, he pushed down his glasses and said, "Now is not the time to be full of sports cars. Put away your mysterious ghost stories."

Shen Qiubai pursed his lips, a bit unconvinced, and was glared at by Zhao Shuyi, but he didn't dare to say it out loud, so he could only mutter in a low voice: "I'm not joking. Isn't this just a ghost hitting a wall, and can't walk in one place all the time. "

He might as well not have said that.Qin Sang swallowed her saliva without a trace, and leaned against Zhong Ziyan.Zhong Ziyan noticed her little movement, and immediately stretched out his arms to wrap her whole body, feeling full of security in the dark environment.

The atmosphere became a bit dignified because of the mixing of some ghost stories.

They could even feel that there seemed to be something extra in the floating dark color that was annotating and spying on everyone's every move.The endless blackness in the distance looks like a shadowy ghost.

"Don't think about it!" Zhao Shuyi was keenly aware of the change in the surrounding atmosphere, and interrupted everyone's fantasy in time.

Qin Pinggui suddenly spoke from the side, his tone was slow but steady: "Actually, we may not always be walking in a straight line."

"What do you mean?" Shen Qiubai asked.

Zhao Shu thought about it, nodded and said: "Old Qin is right. The surrounding light is dim, and the range of visibility is limited. Moreover, the steps on the ground are all exactly the same, and there is no reference at all. We cannot guarantee that we are walking. Straight line. So it may not be a matter of gods, gods and ghosts. Don’t scare yourself and get confused. People have fought all over the world, so there is nothing to be afraid of ghosts.”

Several people seemed to understand what she meant, Qin Sang frowned and hesitated for a moment and said: "However, the steps we walked didn't feel any twists or turns. And... no, it's not a matter of straight lines or not. .This is the stairs, we have been walking down, how can we go back to a higher place? This...how can we walk back to the original place?"

"Penrose Stairs." Fang Yin, who had been silent just now, said suddenly.The discussion of several people gave him inspiration, and Fang Yinfu suddenly remembered a post he had read many years ago.Seeing that everyone was looking at him, he spread his hands and explained: "This is a famous geometric paradox. It is about a staircase that always goes up or down, and you can go straight down, but in fact this staircase It’s actually a closed loop, no matter how long people walk in it, they can’t get out. It’s a bit like…”

Zhao Shuyi squinted his eyes, tilted his head and asked, "Mobius ring?"

Fang Yin's eyes lit up, and he nodded heavily.

"Huh? Something like this?" Zhong Ziyan tried to construct a picture like Fang Yin said in his mind, but no matter how hard he tried, he couldn't do it.His poor imagination and three-dimensional sense do not support him in doing this.

Fang Yin tilted his head and thought for a while, stretched out his hand and gestured, and explained: "It's like this, just like we are now, using the drop and bend to create an illusion of going straight down. And because the distance is long enough, each The steps are adjusted slightly and imperceptibly, and these subtle differences are difficult to detect in a dim environment, creating the illusion of walking in a straight line."

"We don't know the whole picture of this staircase now. It might be too big to imagine. But..." Fang Yin looked at Zhong Ziyan's thoughtful look, and withdrew his hand, with a perplexed expression on his face.

"But what?" Qin Sang tilted her head and asked.

Fang Yin said: "Because this is a paradox. The reason why this is a paradox is that, like the Klein bottle, such a structure cannot theoretically be realized in the three-dimensional space we are in now. .”

"Klein bottle..." Zhao Shuyi frowned, she pushed down her glasses and said, "I'm sorry that I'm just really not proficient in this area."

Fang Yin pulled the corners of his mouth helplessly, shrugged and said, "I don't understand these either. It was written on a post I read when I was in college. I thought it was very interesting at the time, so I read it seriously. In fact, I just remembered these. I don't know the details."

"It's so hard..." Qin Sang sighed and muttered softly.

"The illusion we are in may not be a three-dimensional space." Qin Pinggui rubbed his chin and said softly. Fang Yin's eyes lit up and he clapped his hands excitedly.

How could he forget this.

They appeared in front of Qin Sang and Zhong Ziyan through a certain node before, and they could also disappear through a certain node.There is no way to do this in normal space.In other words, the space they live in is not the space composed of altitude, latitude, and longitude that they are familiar with in the conventional sense.

The extra factors are likely to be the key to trap them here!