Starting as a Wallfacer, his defection to the Three-Body Problem shocked the world.

Crisis Era 14, 2021 AD.

This year marks the 12th year that Lin Xuan has been a Wallfacer, and Ms. Sai, the last of the first batch of rotating chairpersons of the PDC, has also retired from the chairperson position.

She first went to Eden, where she met Garnin and Kant, who lived there. After chatting with them, she went to the Red Coast Base to see Lin Xuan.

"It's an honor to see you again, Mr. Lin Xuan. You still look so young."

Sai said the same things she had said when she first met Lin Xuan.

"But you're already old."

Sai let out a long sigh.

"Yes, I'm getting old,"

“Since the UN era, I have been Secretary-General Say. Later, when the Three-Body Crisis came, I became the rotating chairman of the PDC, organized the Wallfacer Project, and then organized the Ladder Project. The current chaos is also partly caused by me.”

“This is just a historical inevitability, Ms. Sai, there’s no need to be sad about it,” Lin Xuan comforted her.

Sai shook his head slightly.

"No, I'm not trying to comfort myself, but stating a fact: as a politician, I am incompetent. I spearheaded the Wallfacer Project, and in theory, I should have been convinced of its success. But now, I'm starting to doubt myself and the Wallfacer Project."

"It's probably because of your surroundings; after all, this is a time of great downturn."

"A major downturn?"

Sai thought for a moment.

"A good name, indeed a very apt description, that humanity has entered a period of great decline."

Lin Xuan really wanted to say that this was only the beginning of a great period of decline, and that the phenomenon of cannibalism had not yet begun. However, she thought that saying this would be as absurd as telling the young marshal: "Young marshal, we should launch the Xi'an Incident."

After all, the term "Great Depression" is a later evaluation of this period of history. When Lin Xuan first came to this world, she referred to the Trisolaran fleet as the Trisolaran First Fleet several times, which shocked everyone around her.

"So what's your current status? Resigned? Retired? Or something else?"

Lin Xuan wasn't very familiar with the UN and PDC's job system. After all, theoretically, Say was no longer the rotating chair of the PDC, but should still be doing some related work for the PDC.

"I'm preparing to resign, but I have some things to do before that."

As he spoke, Sai took out a tablet, which was currently displaying a website.

"Human Diary?"

"Yes, this is a memorial website created by my team. Its purpose is to allow as many people as possible to record their daily lives in words and images as part of the record of civilization. Currently, the website has more than one billion users."

"Then, I plan to send this data, along with information on human civilization and commemorative artifacts, into space using a spaceship. I call this project the Human Memorial Project."

Lin Xuan thought for a moment and nodded slightly.

"That's a great idea, why don't you just do it? Why are you coming to me?"

"I'm here to ask you for..."

Sai suddenly fell silent halfway through her sentence, as if she realized that her statement was somewhat incorrect.

“I’m here to borrow those artifacts from you. You shouldn’t be short of antiques like these, since you took them from the British Museum. Why don’t you let me handle them?”

Lin Xuan was also taken aback when she heard this.

How did you know I took it?

"The whole world knows, Mr. Lin Xuan, that only you have this ability. Are you treating the whole world like fools?"

"All right……"

Lin Xuan scratched her head.

"The problem is that I returned those things to their rightful owners a long time ago, so getting them back might be a bit troublesome."

Upon hearing this, Sai appeared somewhat disappointed.

"But I have another idea that's much more meaningful than your crazy idea of ​​throwing junk into space."

"what?"

Sai immediately became interested.

"The essence of your project is actually to leave a trace of human existence in the universe, right?"

Sai nodded slightly.

"Then why not build a projector in space to project images of these artifacts?"

Sai was taken aback; he didn't quite understand what Lin Xuan meant.

"Projection? How do you project?"

"Do you know the standard model?" Lin Xuan asked.

“I know a little bit, but you know me, Mr. Lin Xuan. I used to be the Secretary-General of the United Nations, and I only did some clerical work in the PDC, so I am not very good at physics.”

Lin Xuan had no choice but to start explaining the theory from the beginning.

"The Standard Model is a theory in particle physics that describes the three fundamental forces—the strong force, the weak force, and the electromagnetic force—and the fundamental particles that make up all matter. It mainly explains how matter is formed, how they are combined together, and why particles have mass."

"We call the particles that make up matter fermions, which are the things that decay into quarks. You should know what quarks are, right? They are the smallest particles known in physics."

Sai nodded slightly.

"Okay, just so you know. This has nothing to do with what I'm about to say."

Sai: ? ? ?

"What I'm talking about is another system within the Standard Model, the photon in the boson."

"Photons are the fundamental particles that transmit electromagnetic interactions, that is, they are a kind of medium."

"Let me give you an example you can understand," Lin Xuan said, looking at Sai who was completely bewildered.

"Imagine you and me, you're called Electron 1 and I'm called Electron 2. We both have 100 yuan. If you give me 30 yuan, you'll only have 70 yuan left. The process of you giving me the money is the process of an electron emitting a photon. Because you gave me 30 yuan, you now only have 70 yuan. You've gone from being rich to being poor. That is, the process of an electron changing from high energy to low energy."

"Then, now that I have your money, I have 130 yuan. I've gone from being a rich person to being even richer. But I'm a very confident person. I get carried away when I have money. I start throwing money around and then I throw the money you gave me back. That's what instability is."

"Then we kept tossing the money back and forth, and that process was a release of electromagnetic force."

Sai was completely dumbfounded.

“Mr. Lin Xuan, please just state the conclusion you want. These theoretical parts are beyond my area of ​​expertise.”

Lin Xuan nodded slightly.

"I want to create a 'painting' in space, similar to some kind of radioactive material. This radioactive material will release the particles I want, which are the 'pigment.' Then, using a special 'brush,' I will apply the pigment and write down the history of human civilization in the universe. In this way, this 'painting' will be displayed in space forever."

"This could be a very large project."

Lin Xuan nodded slightly.

"Yes, but it's worth a try. After all, if we succeed, humanity will have the ability to use the universe as a canvas, and you and I will become Van Goghs, truly leaving something behind in this starry sky that belongs to us."

Ultimately, the PDC agreed to the plan. Although they were reluctant to spend so much money just to draw a picture in the universe, the suggestion came from Lin Xuan. The Trisolarans feared Lin Xuan, so the PDC always took her proposal very seriously.

This project was named the "Van Gogh Project".