Mark felt as if he was floating in a completely gravityless ocean, and the memories in his mind were glowing bubbles floating in the deep ocean, and many things that he had long forgotten also emerged, and Mark took this opportunity to sort out the information he had obtained from the crystals.

Just as he quickly flipped through his memories, he found a chain of bubbles connected into a string, and looking down at it, Mark's memory door was opened little by little, and Mark unconsciously smiled, even in a dark and cold dream, he could find a rare warmth.

At that time, he often ran around the library on campus, and over time he found a strange person, he fixed every day, sitting on the balcony of an old teaching building and sketching with paint, it stands to reason that it is not particularly strange to meet some very diligent art students on campus, but his paintings are not like the structure and scenery that ordinary art students usually practice, he just paints the same sky in a fixed position every day, at a fixed angle, a sky without clouds, His canvases don't seem to change from day to day, just layered on top of each other with paints of similar colors.

One day and two days...... Three days, half a month later, Mark can still see him every day, his canvas has changed side, but the way he paints is still the same as before.

"What are you practicing?" Mark finally got tired of his curiosity one day, so he walked up to him and asked.

"Well, I'm practicing observation, or rather...... I'm just thinking. The man reacted for a long time before he realized the presence of the person around him, and replied to Mark with his glasses on his hands. "Some people are used to walking while thinking, some people are used to bathing in the bathtub, but I am used to showing my thoughts like this." ”

His painting method is somewhat similar to the pointillism of the Impressionist painter Seurat, in which he uses evenly sized colored spots to accumulate the feeling of the block. The difference is that this guy is obviously more obsessive-compulsive and rigorous, each color dot is as regular as the pixels of a digital camera, and every three color adjacent to each color with subtle differences as a group to form a common color impression, no wonder it takes him so long to paint a sky, but for people who are generally not sensitive to color, it is just a large piece of blue with no change in color.

But in Mark's view, he thinks it's a very scientific and rigorous way of painting, similar to the three-color picture tube of television, except that the man controls it in a narrower color gamut, and this small piece of painting contains more layers of information. Because under this painting method, the degree transfer of color scale and gray scale is so logical and smooth, and even makes people have the illusion that the color is flowing, and the color in the center radiates a kind of repulsion to the outside, as if to push the color of the edge out of the painting method and expand infinitely in the void, turning it into a completely unrelated thing to color, in short, the information is folded, just like a travelogue sprinkled with tens of thousands of words, and it can also be completely contained in its spirit with a poem of 20 words.

"You're not drawing color, you're drawing energy," Mark exclaimed in surprise before the man smiled and looked back at Mark.

"Haha, you're the only one who has actually understood my paintings for so long"

Mark was very impressed by that scene, because it was from that time that the two of them became friends, and after a conversation, the two of them started talking on the stairs of the old school building, and Mark was the first to say his name, and then the strange weird slowly said his name.

"My name is Sun Tan."

"What, you're Sun Tan, don't tell me you're what the newspaper reported...... Sun Tan, who was involved in the International Mathematician Research Project when he was in high school. Mark was shocked as if he had thought of something, "I didn't expect you to be in the same school as me." ”

"That's me, let's be honest...... It's just that the report is exaggerated, and I haven't achieved much since then, and that paper is only a part of my grandfather's conjecture, and it is not a purely theoretical mathematical research, just a mathematical model related to economics," Sun Tanfeng replied lightly.

"You are too modest, because economics involves human social science factors, sometimes it is even more complicated than pure natural science, because it involves a deep insight and understanding of society, which is not something that young people can solve with the so-called IQ alone, and may also need a kind of wisdom that has been refined over the years. So the average age of the members of that society is over 70 years old, and if they can let you join, it means that they recognize your "wisdom". This is not an easy task. ”

Later, the two gradually became acquainted, and what is more interesting is that the more the two get along, the more they dig out surprises in each other, and there are more and more common hobbies, Mark has become a tool man who often goes to Sun Tan's laboratory to help, and Sun Tan and Mark have also done a lot of pranks that they haven't done before, such as using a private walkie-talkie, interfering with the school's radio station. Every time Sun Tan's scientific research paper has a manuscript fee, Mark will be invited to dinner, and Mark also took Sun Tan to Xuanyuan Frame for half a month to survive in the wilderness, and there is a very wonderful tacit understanding between the two.

In his senior year, Mark had disappeared silently for a while, and when he reappeared, Mark called Sun Tan to the dining room ceremoniously, and happily took out a certificate of qualification approval to serve on the moon from his backpack, his dream since he was a child, and now it has finally come true, he wants to share this happy moment with Sun Tan.

At this time, Sun Tan also silently took out an invitation sheet from his bag to participate in the construction of the moon as a scientific researcher, and the two looked at each other's faces and laughed. A few months later, the two packed their bags separately and flew to the space they had longed for in the same spaceship.

At that time, civilian launch vehicles had not yet become widespread on Earth, and this was the first space trip in the lives of Mark and Suntan. In front of the screen, Mark and Sun Tan could see the images sent by the ground monitoring center, the high-temperature burning liquid fuel propelled the rocket through a beautiful trajectory in the sky, as the knots were peeled off, the spacecraft was soon about to fly over the Kármán line on the earth, they began to enter the zero-gravity space, and began to experience a feeling of weightlessness and floating.