(Foreword)

What we think we see is not necessarily what we see. We are always looking for answers for our own assumptions.

(Text)

October 30, 2021 at 11:45 a.m

About a dozen seconds passed.

"You're right, I thought I'd be waiting here for a long time, but I didn't expect you to find out so soon." We suddenly heard Zhang Han's voice. But there was still no sign of him around.

The music we had heard came to an abrupt halt.

Zhang Han !! Is that you? Where are you? Lin Yun shouted into the empty exhibition hall.

"That's right, it's me. I'm right here, Cheng Yin, and I'm curious to know how you discovered the secret of this electric wall. Zhang Han's voice resounded throughout the exhibition hall.

"Actually, if it weren't for the fact that you discovered this secret earlier, I guess it would be really difficult for me to know the subtlety of this design." My voice is still very loud, loud enough for Zhang Han to hear.

"Me? Sounds interesting. ”

"Since everyone came to this exhibition hall, due to Cui Li's rash impact, none of us approached this electric wall, but you walked along the electric wall alone, and stopped from time to time, thinking about something. But I feel very puzzled, because the electric wall is not visible, so everyone is far away, but only you are different, I feel that you are not afraid of this electric wall at all. At first, I didn't understand it, but now I know that it's not that you're not afraid, but that you understand this electric wall. Am I right? "I looked straight to the other side of the electric wall and seemed to be able to see through everything.

"I knew it! It must be some kind of test, the same as the previous one, isn't it? Cui Li looked extremely angry.

"Cui Li, calm down, Zhang Han should have nothing to do with the activation of the security settings this time, he, like us, just discovered the secret of the electric wall early." My words softened Cui Li's anger a little.

"And how did he find out?" Li Ruina returned the topic to the electric wall.

"This brings us back to the three mistakes I made earlier. First: When we first entered the room, we thought that all holographic projections were turned off. Second: We always thought that the electric wall in front of us was invisible. Third: We think we can see the other side of the electric wall. Actually, we were all wrong. And it's completely wrong. "I gestured with my right hand to the numbers.

"Do you mean this wall of electricity is visible? I don't understand. "Zhao Yuyu also walked to my side.

"That's right, we thought all the holographic projections were turned off at first, but in fact we were wrong, we just turned off some of the holographic projections on display, but at the same time, we opened this invisible 'electric wall'."

"What? Is this 'electric wall' just a holographic projection? Impossible. I could clearly feel the electricity when I hit it before. The second time, it was directly bounced off by the current. How can this be fake. Cui Li's face was full of doubts.

"It's true that this 'electric wall' is a holographic projection, and it's true that you are hit by an electric current. But it's not the 'electric wall' in front of us that hits you, it's the power grid behind the 'electric wall' of this holographic projection! Cui Li, have you forgotten one of the most basic common sense? "I didn't take my eyes off at all.

"You're saying air doesn't conduct electricity? How did I forget this. Cui Li patted his head as he spoke.

"Zhang Han, I believe you have found the switch of the 'electric wall'. It's also time to close this invisible 'electric wall'. I said out loud.

October 30, 2021 at 11:50 a.m

……

The exhibition hall is square in shape, and what we call an 'electric wall' divides the entire rectangle in two. I was standing in front of the 'electric wall'.

Suddenly, the 'electric wall' in front of us disappeared, in fact, visually we can't see the process of disappearance, for us the difference from before, that is, in the place of the 'electric wall', there is an extra power grid and Zhang Han standing on the other side of the power grid. However, this power grid is not like an 'electric wall', but there is a gap, and that position is exactly where Zhang Han walked towards the 'electric wall' at that time.

"Originally, the so-called 'electric wall' was just a hologram projected by the power grid. And this hologram is projected on the other side of the exhibition hall, so we thought that this 'electric wall' was invisible. Xia Cheng seemed to have a sudden realization.

"But didn't we come in at the same time? How did Zhang Han discover this secret in advance? Li Ruina asked suspiciously.

"Actually, Zhang Han should have discovered this secret very early, but he just spent his time looking for a gap in the power grid."

"Is this so possible? Did he know the secret in advance? Li Ruina looked at Zhang Han on the other side of the power grid.

"In fact, the secret of this 'power grid' is really difficult for us to discover. But it is not difficult for him to discover this secret, and the answer lies in his headphones. "I once pointed to my ear.

"Headphones? Did someone give him a hint? Impossible. The signals here are all blocked, how can he get a hint? Cui Li looked at me in disbelief and said.

"It's not that someone gave him a hint, it's the noise. Cui Li, let me ask you, what happens when an electric current passes through? ”

"Electromagnetic fields! It turns out that this is the case, and an electromagnetic field is generated due to the passage of an electric current. Thus interfering with the headphones, a slight noise will appear. ”

"You're right, and Zhang Han should be very sensitive to the sound quality of the headphones, and a little noise should be difficult for us to hear, but it couldn't be easier for him." I said confidently.

"I see, no wonder you said that he was walking around the 'power wall' before, and it turned out that he was looking for a gap in the power grid based on the noise generated by the current. Did you use your phone to confirm this before? Xia Cheng looked at me and confirmed.

"That's it." I finally looked away and looked at everyone.

At this point, the mystery of the 'electric wall' of this exhibition hall has been solved.

We went from the gap in the power grid to the other side of the exhibition hall. I glanced at Zhang Han, and he brought the cool headphones again, and I realized that the volume of the headphones had been significantly turned up. It seems that Zhang Han is not as indifferent as he appears. I smiled at him. But as usual, he ignored me and walked towards the passage on the left.

I remembered the familiar melody again.

"My future, whose future is it, I stand at the apex, looking out at the sea..."

……

"My future, whose future is it, I stand at the apex, looking out at the sea..."

(End of chapter)