Mu Yun looked at the wall of the staircase, and the number was still "6".

？？？

What's going on, the ghost hit the wall?

Qu Ruolan said: "This is a Penrose ladder. ”

When Mu Yun heard this, he suddenly realized: "I know this!

The Penrose Ladder is a well-known geometric paradox that refers to an infinite loop of stairs where you come from, whether you go up or down.

In physics class, Mr. Song once told his classmates about this ladder.

Later, when the game "Monument Valley" became popular, Mu Yun also played it on his classmates' mobile phones, and there were many scenes in this game where the Penrose Stairs appeared.

"Such a ladder cannot exist in reality, hence the name 'impossible ladder'. ”

Mu Yun said excitedly: "The similar Penrose ladder that appeared in reality,

"In fact, it all depends on the illusion of the human eye.

"So, just change the angle or walk in a different footwork, and you can get out!

"I've cleared Monument Valley, you see, I'll be able to get out of this staircase in no time!"

However, Qu Ruolan shook her head and said, "It's not that the Penrose Ladder can't exist in reality.

"Exactly, it just can't exist in 'three-dimensional space'.

"It's like the Möbius circle is an impossible object in two-dimensional space, but it is easy to realize in three-dimensional space.

"The Penrose Ladder can be easily implemented by placing it in a higher level of space. ”

"What?" Mu Yun was stunned, "You mean...... Is this a real Penrose Ladder?"

"That's right," Qu Ruolan nodded, "In other words, we have unconsciously entered a higher-dimensional space. No wonder the jade flute is useless, we are no longer in the illusion. ”

Mu Yun couldn't help but be anxious: "Then what should I do? The Penrose Ladder is an endless loop, and no matter how you go, you can't go to the end." ”

"It's a pity that I haven't reached the realm of operating in a high-dimensional space yet. ”

Qu Ruolan sighed and said, "Otherwise, if you go through the wall and escape to the ground, these will not be a problem for me." I don't think I'll be stuck in this place. ”

Mu Yun thought for a moment, and suddenly looked up to the sky and said with a long smile: "Hahaha, I have thought of a way to crack it!"

Qu Ruolan was stunned when she heard this, and said, "Really?"

Mu Yun looked confident and replied, "I was in a hurry before, and I completely forgot that I had awakened now. ”

"Oh, does the Qilin still have the ability to break the phantom array? I don't think I've heard of it. ”

Qu Ruolan smiled and said, "So, what is your method of cracking?"

Mu Yun replied matter-of-factly: "Isn't it just a broken staircase that can't go to the end?

"I've decided to jump out of here so I can go straight outside?"

"I tried it when I was running a mountain road, and I was basically fine when I jumped off a three-story building.

"This is only the sixth floor, even if I jump from here, I won't be able to fall to my death!"

Before Qu Ruolan could stop him, Mu Yun turned over and jumped over the railing at the corridor and jumped from the sixth floor.

When he was about to touch the ground, Mu Yun began to adjust his posture, ready to land perfectly.

Suddenly, a whirling feeling of dizziness came, and then Mu Yun slammed on the floor.

Mu Yun rubbed his waist with one hand and said, "Oh my God, this fall hurts too much......

He propped up the ground with his other hand and got up from the ground with a disgraced face: "But I escaped anyway, and you want to trap me with a broken staircase......?"

But halfway through his laughter, he couldn't laugh anymore.

Because Qu Ruolan was standing less than half a meter away from him, smiling and waving to herself.

Mu Yun knew immediately: he was back in the stairs.

He couldn't help crying and said, "What's going on, haven't I already jumped off?" and I fell like this, and I sacrificed so much, why did I go back to this broken staircase?"

Qu Ruolan continued to smile and only said one sentence: "Klein bottle." ”

The Klein bottle is also a geometry that cannot exist in three-dimensional space.

It refers to a plane that is not oriented.

There is no "inside" or "outside" for Klein bottles, and a fly can fly directly from the inside of the bottle to the outside without passing through the surface of the bottle.

Mu Yun immediately understood that the entire building had become a Klein bottle.

That's why he just jumped out of the building and returned to the inside of the building.

Penrose Ladder Plus Klein Bottle –

One is "headless and tailless", and the other is "inside and outside".

trapped the two of them so that there was no way to go to the sky and no way to enter the ground.

Mu Yun couldn't help but collapse his mentality.

"Don't worry, I'll see if there's any other way to get out. Qu Ruolan said comfortingly.

But what he actually thought in his heart was that apparently they were trapped in a higher space than three dimensions.

As a low-dimensional being, it is already difficult to even imagine what a high-dimensional space looks like, let alone escape from it.

Now they may not be able to fly.

Just when Qu Ruolan was at a loss, Mu Yun suddenly stood up straight, as if he was about to make a move.

Qu Ruolan looked at him in a daze, and almost subconsciously blurted out: "What are you going to do?"

He has fully seen that Mu Yun is a man of action, not only will he do it immediately when he thinks of something, but even in some cases, Mu Yun is very likely that his body is moving faster than his brain.

"Uh...... People have three urgency, I want to go and pee. Mu Yun said.

Qu Ruolan: ......

In fact, when Mu Yun first started, he woke up to go to the toilet.

However, the toilet was not completed, and it was directly stuffed into the wardrobe by Qu Ruolan, and then it has not been solved, and the result is until now.

The moment he just jumped off the building and fell to the ground, it almost blew his bladder upside down.

Qu Ruolan nodded and said, "I'll go with you." ”

Mu Yun was stunned: "No, I'm not a three-year-old child anymore, and I don't need to be accompanied to the toilet." ”

"No, this space is very weird, I'm afraid that if you are alone, you will fall into the enemy's other traps. Qu Ruolan explained, "So, from now on, it's best for the two of us to keep acting together at all times." ”

This line ......

It's simply after the corner of the male and female protagonists in the TV series is in danger.

The female protagonist proposes to go to the toilet, and when the obscene male protagonist wants to take advantage of the opportunity, he will definitely say the gold medal lines.

However, now, it is a man who is good enough to be the heroine in any TV series, and he said such things to another man, which made Mu Yun feel an indescribable weirdness.

But Mu Yun's complex psychological activities are not easy to explain to Qu Ruolan.

However, Qu Ruolan seemed to see Mu Yun's embarrassment and said, "Don't worry...... I'll be waiting outside the toilet door. ”

So the two went back to the toilet.

The flying stream went straight down to 3,000 feet, and it was suspected that the Milky Way had fallen for nine days.

Mu Yun was finally liberated, and his brain suddenly relaxed.

He habitually pressed the flush button before remembering that the water tank was broken and could not be flushed.

He couldn't help but look down at the urinal.

But it's okay not to look at it, and when he saw him, he immediately shouted: "Big guy, come here!"

Qu Ruolan heard Mu Yun's voice very urgently, as if she had made some major discovery.

So she didn't have time to think about it, Qu Ruolan rushed directly into the toilet, and asked Chao Muyun eagerly, "What's the matter, is there any new discovery?"

I saw Mu Yun pointing to the urinal, and said in a 100,000 anxious and urgent tone: "Look at the pee I pulled out!"

Qu Ruolan's heart was surging at the moment.

Before going to the toilet, I was so squirming and pinching, but after I finished it, I was in a hurry to come in and see your pee......

What the hell is this operation???

Qu Ruolan's eyelids twitched, but she still glanced over slightly.

Then he frowned, and said in disbelief, "Hmm, this is ......."

In the urinal, there was a pool of golden liquid, shaped like a snake, but at the top was a small arrow, gently moving from side to side.

"Big guy, look at this arrow, doesn't it look like a hint in a maze game?"

Mu Yun said, with irrepressible excitement in his tone, "And looking at its movements, it seems that you want us to follow it?"

Then, the little snake crawled out of the urinal, twisted left and right on the floor along the tiles, and turned out of the toilet.

Qu Ruolan said: "We will also follow." ”

"Really, could there be a fraud?" Mu Yun looked uncertain.

"By this time, you're cowardly?"

Qu Ruolan was angry and funny: "Anyway, you pulled it out, I'm not afraid, what are you afraid of?"

After speaking, Qu Ruolan followed the little snake and walked out: "If there is fraud, you are the only one who asks!"

Mu Yun didn't have time to say more, so he hurriedly followed.

The golden liquid snake, after walking out of the toilet, crawled straight to the corridor on the sixth floor of the apartment, and stopped at the entrance to the stairwell.

Next, it depends on how you go, Mu Yun and Qu Ruolan thought so almost at the same time.

The snake seemed to think for a moment, then twisted itself and began to climb up the wall.

Climb and crawl until they reached a corner of the ceiling, and suddenly they got into it and disappeared.

Mu Yun and Qu Ruolan looked at each other.

In the next second, the little snake poked its head out again where it had disappeared and twisted its small arrow at the two of them.

Both understood what it meant.

So, Mu Yun stretched out one foot and stepped on the wall of the stairwell, where the little snake had just crawled.

He was amazed to find that he could stand on a wall on both legs.

In this space, it seems that gravity has lost its original effect.

Mu Yun began to step on the wall and walked.

"I see, in high-dimensional space, gravity can also be changed. ”

Qu Ruolan suddenly realized, "Follow it, and you will find your way out!"

The two of them followed the route that the liquid snake crawled on the wall until they reached the point where the snake disappeared, and at this moment the two of them were hanging upside down and stepping on the ceiling at the same time.

Qu Ruolan motioned for Mu Yun to go first, and he was behind.

So Mu Yun slammed his head into the ceiling.

However, there was no impact on the head, and the whole body went straight through the ceiling.

A feeling of dizziness came, and Mu Yun finally gained a foothold.

When he opened his eyes, he saw Qu Ruolan also following and appeared behind him.

The two of them looked around left and right, and at this moment, they returned to the toilet of Mu Yun's house.

The toilet bowl is broken, and water is trickling out.

Tonight, I don't know how many times this scene has been repeated.

But this time, Mu Yun heard the honking of horns coming from the main road, the sound of cars whizzing by, and the intermittent chirping of insects.

Mu Yun tentatively pushed open the toilet door.

Outside the door, the living room was quiet, just like usual.

The two of them walked to the balcony again, and the glass that fixed the window was intact, and this time, the glass window could not be pushed no matter how much it was pushed.

In the distance, the east began to show the white of the fish's belly, and it was already 6 o'clock in the morning.

Mu Yun turned his head and asked Qu Ruolan beside him, "So, we ...... this time Is it really back?"

"Zhuang Shengxiao dreams of butterfly ......"

Qu Ruolan muttered, and then began to grope in her pocket: "Wait, I seem to have brought a spinning top, just take it out and take it around." ”

"What the hell, are we filming Inception!"