After driving the children away, the little ghost on the tree smiled and said to Chen Song: "Big brother, you drove the children away, who will play with me?" Come up and swing too! I've been waiting for you here for so many days, just to ask you to come up and swing. ”

"Why am I afraid?! Swing on the swing, I'm still afraid that you will not succeed? Chen Song shouted angrily.

"Come up and play. Hee-hee. The imp said.

Chen Song sat on the swing and swung it, scolding the little ghost while swinging: "Grandma, don't you just ask me to swing!" Why don't you invite me to play ball, have a big meal, go to a movie, or go to a concert? Suddenly a gust of wind blew, and Chen Song's swing swung high, almost like we were sitting on a hurricane flying chair in an amusement park. A feeling of weightlessness hit, and Chen Song felt a lot of enjoyment.

"I'll let you hear the music right away." The imp said.

When Chen Song was worried about the little ghost making trouble, he heard the sound of beautiful music, this sound is simply the sound of heaven, like the fairy music in the sky, only to hear Chen Song fluttering immortals, Chen Song heard the wonderful feeling of music, in fact, more than 2,000 years ago, Confucius also had similar feelings, so the "Analects" said that Confucius listened to the music of "Shao" in the country of Qi, "I don't know the taste of meat in March".

Chen Song felt very strange, every time he swung on the swing, he would emit a wonderful music. It's like there's a mysterious figure playing the strings. Chen Songdang was fast, and the rhythm of the music was also fast, Chen Songdang was a little slower, and the rhythm of the music slowed down. Chen Song swayed hard, and the sound of the music became heavier, Chen Song stopped, and the music also stopped. Chen Song closed his eyes and let the swing swing swing freely, and as a result, the music also emitted a free and light sound.

Chen Song was swinging and enjoying the music at the same time, and he felt that this was the most wonderful moment of his life. He thanked the imp, if he hadn't invited him to come to the swing, would he have been able to enjoy the beautiful music? If Chen Song went to pull Beethoven or Mozart out of the coffin and ask them to play the piano, would he be able to afford the price? Besides, can Beethoven and Mozart play such beautiful music?

"Is there a fairy playing the harp? But why did the fairies come to our backwoods? Chen Song thought.

Another piece of music sounded, and Chen Song gradually entered the artistic conception of music. I saw that the river tide in spring was mighty, connected with the sea, and a bright moon rose from the sea, as if gushing out with the tide. The moonlight shines on the Spring River, and with the waves shining for thousands of miles, there is bright moonlight in the Spring River in all places. The river meanders around the flower-filled fields, and the moonlight shines on the flower-filled woods like fine snowdrops. The moonlight is like frost, so the frost flies unnoticed. The white sand and moonlight on the continent blend together, and it is difficult to see clearly. The river and the sky are one color, there is not a trace of dust, and there is only a lone moon hanging high in the bright sky...... This is clearly Zhang Ruoxu's poem "Spring River Flower Moonlit Night" in the Tang Dynasty, Chen Song has long memorized this poem backwards, as evidenced by the poem:

The tide of the spring river is even with the sea, and the bright moon on the sea is born together.

Thousands of miles with the waves, where there is no moon in the spring river!

The river flows around Fangdian, and the moonlit flowers and forests are like hail;

The frost in the air does not fly, and the white sand on the Ting cannot be seen.

Jiangtian is colorless and dustless, and the lonely moon wheel in the bright sky.

Who first saw the moon on the riverside? When did Jiang Yue shine at the beginning of the year?

Life has been infinite for generations, and Jiang Yue is only similar every year.

I don't know who Jiang Yue treats, but I see the Yangtze River sending water.

The white clouds are gone, and the green maple is not worried.

Who's going to be in the boat tonight? Where is Acacia Moon Tower?

Poor upstairs wandering for the moon, should be taken away from the makeup mirror.

The jade-household curtain can't be rolled up, and the clothes are smashed and returned on the anvil.

At this time, we don't hear each other, and we are willing to shine on you month by month.

The wild goose flies for a long time, and the fish and dragon dive into the water.

Last night, the dream of the idle pool fell, and the poor spring did not return home.

The river flows to the end of spring, and the moon falls in the river and the lake slopes westward.

The oblique moon sinks into the sea fog, and the stone Xiaoxiang has an infinite road.

I don't know how many people will return to the moon, and the falling moon will shake the river trees.

After listening to this music, Chen Song asked the little ghost: "Where is there such a beautiful scenery as the Spring River?" I'd love to check it out. ”

"Yes, you follow me, and I will take you to Chunjiang in music." The imp said.

Chen Song got off the swing and followed the little ghost. The little ghost took Chen Song to the place next to Qinglong Pond where he had dug earthworms that day. Chen Song silently stared at the dim moon reflection in the pool, and at the same time, he also saw his own reflection in the pool, looking at it, only to see his reflection slowly disappearing. It's really strange, how can I not have a shadow? Does a person without a shadow still have a physical body? Only ghosts have no shadows, and things that don't exist in shadows are still necessary to exist on the earth?

A voice sounded beside him: "Because you are too far away from the pool, you can't see your own shadow." You jump in and get closer to the pool, and you can see your own shadow. "It turned out that it was the imp who was encouraging him to dive. The little ghost has been seducing him for the past few days, first seducing him to swing, and then using the vibration of the swing to produce a kind of seductive music, making him slowly lose consciousness and be at the mercy of others.

Chen Song was in a daze, controlled by the little ghost, and completely lost consciousness. He seemed to hear the call of his parents, but he couldn't help but open his arms and jumped into the Qinglong Pond.

Why did Chen Song's image of Qinglong Pond disappear? It turns out that this involves the "cosmic symmetry" in physics. Cosmic symmetry means that an elementary particle is perfectly symmetrical with its "mirror" particle. When a person looks in the mirror, the image in the mirror is always of exactly the same nature as the real self – including appearance, dress, expression, and movement. In the same way, all the properties of an elementary particle and its "mirror" particle are exactly the same, and their laws of motion are exactly the same, which is the "conservation of cosmology". If a particle rotates clockwise, its mirror particles appear to rotate counterclockwise from the mirror, but all the laws of this rotation are the same, so that the particles inside and outside the mirror are cosmicly conserved. According to Noether's theorem, the conservancy of cosmic symmetry corresponds to the invariance of spatial reflection (the so-called spatial reflection, which generally refers to mirror images). In a sense, we can understand individual particles under the same kind of particles as mirrors of each other. For example, if one electron spins clockwise and the other electron spins counterclockwise, one electron can take the other electron as a mirror self, just as a person looks at himself through a mirror. It follows that, according to the theory of conservation of universal symmetry, all electrons should follow the same laws of physics in their own environment and in their mirror environment, as is the case with other particles. However, in 1956, Yang Chenning and Lee Tsung-dao discovered that the "θ-τ" particle is cosmic non-conserved under weak interaction. The views of Yang Zhenning and Lee Tsung-dao shook the physics community at that time, and they tore a gap in the perfect physical symmetry world!

Just as at this moment, Chen Song watched his reflection at the waterside of Qinglong Pond, his shadow and the underwater world in Qinglong Pond, which is different from the basic constants of physics, had a weak interaction, and there was also a phenomenon of non-conservation of cosmic symmetry under weak interaction, so his shadow disappeared, and under the bewitchment of the little ghost, he was so depressed that he wanted to jump into the waterhole to destroy himself.