In fact, the principle is very simple, they use the method of reflection imaging of ancient mirrors to refract our images onto the jade on both sides of the upper phase. Because the image is blurry, and there are concave and convex grooves carved in the jade, it looks extremely scary.

As for why Yan taught them so really, it is natural that they are not far from us at all.

The top of the spiral tower of the pagoda itself is spiral-shaped, refracted by the light source of the jade itself, so there will be a movement trajectory in two opposite directions.

Actually, these are just things that I thought about later. At first, I only deduced that it was a mirror anti-theft mechanism, and the fundamental analysis is so thorough now.

When I finished speaking, these students didn't understand at all, and their faces were full of confusion! However, in order to cater to my mood, even if they didn't understand, they pretended to understand and nodded their heads again and again.

And when I said this, something suddenly came to mind. Tang Bao seemed to be nagging me just now, he heard Old Man Yan say that this might be the temple of some ghost clan.

I think Old Man Yan must have read those Sanskrit texts, and I guess he definitely guessed something, so he made this judgment!

But now that we're throwing a tantrum, you let me lick my face and ask him, there's not even a door for this! But if you don't figure it out, you just go down in a daze, and you may have to make a big mess! No, I'll have to find someone to ask!

Thinking of this, I squeezed my eyes at Geng Whispering, and whispered in her ear: "Whispering girl, my brother has discussed something with you, you will go to Professor Yan's coaxing later, just say that you want to know what is going on in the Ghost Clan's Hades Temple, and let him tell you!" ”

When Geng whispered that I called her a whispering girl, and claimed to be her brother, she replied shyly as if she had been favored and frightened by a century-old concubine, and her face turned red.

My action happened to be watched by the few people next to me, swarming to me, and coaxed again and again to join in the fun: "Eh, Teacher Erdou, what are you whispering to Geng Whispering, why do you make our whispering classmates' faces red!" ”

"That's it, that's it! Teacher Erdou, you can also tell us about it, let us be happy too! ”

When I heard this, my face drooped down at that time, and I knocked them with a brain crash, and replied: "Go and go, what the hell are you doing, stay and go!" ”

Originally, Geng whispered that this girl was bold and careful, and she was very courageous, so that these boys were blindly coaxed, and she was stunned to suppress her straight energy. She quietly observed Professor Yan for a long time before she turned around and asked me, "Teacher Erdou, Professor Yan's temper is not very good, let me ask like this, okay?" ”

"What's not to do, teacher, preach, teach, and solve doubts! If he can't even do this, then he won't be a professor, just go home and farm! Alas, I can tell you, did you see the big skeleton on the other side! It's the Yalu Witch's Tomb in front of this eye, if we don't understand this ghost hall, we won't even think of it when we go in later! The dead statue, maybe who's worse than whom! ”

"Oh, Mr. Erdou, don't scare me, it's so serious!"

"Damn, don't ink, hurry up!"

Geng whispered that I was a little annoyed, gritted his teeth, got up and went to Professor Yan, patted him lightly twice, and didn't know what to say in Professor Yan's ear, which made Professor Yan laugh, and even looked at me with a look of kindness.

I slapped my thigh in my eyes, and said in my heart: "Ruined, this girl may not have buried me in Professor Yan just now." ”

Professor Yan finished laughing, took off the bottom of the bottle, and wiped the tears from the corners of his eyes. He shouted and called several of his students to his side. I sighed very melancholy, pointed to the river we had just walked, and began to analyze it!

I pricked up my ears and listened, and it turned out that Professor Yan deduced that this realm might be the underground priest temple of a nation that disappeared from the world a long time ago, the ghost clan.

Speaking of ghosts, it is actually a very weird people who worship ghosts and gods. They believe that whether it is the ancestral spirits, animals, plants, or some natural objects and natural phenomena, including mountains, stones, caves, water, wind, rain, thunder, lightning, etc., they all have souls due to the possession of some kind of "ghost" or "god".

These souls never die, and when something doesn't exist, its soul is transferred to other objects.

And the Sanskrit text we see on the stone wall is the sacrificial text used by the ghost clan to ask the gods to exorcise ghosts, also known as the ghost book. It restricts a series of social activities such as funeral, sacrifice, marriage, construction, travel, divination, festivals, and production of the ghost people. Whether it is to determine the good luck of things, to identify ghosts, or to exorcise ghosts and send ghosts, and to beg for blessings, the ghost master finds the basis from the ghost books.

In the ghost clan, those who can read and use ghost books are called "ghost masters" by the clansmen. Their status in the foot is very high, and they are admired by all people, and no one dares to disobey.

And for those ghost people who believe in ghosts and gods, ghost books are decrees given by God. In fact, the inheritance of ghost books is a bit like the hereditary ancestral training of "Qimen Dividing the Golden Dragon Jue" in our family, which has always been passed on to men but not to women, and leaflets are not worn in pairs. Generations of "ghost masters" will pass on the ghost books through the oral situation from generation to generation, and will not easily tell outsiders.

After listening to it for a long time, Professor Yan actually didn't say anything important. Although I don't understand the essence of the ghost book in his mouth, but judging from the ghost patterns depicted on the rock wall of the grotto, it is also inseparable from the nine stars of the celestial phenomena, the twenty-eight nights, the heavenly stem and the earthly branch, the four times and five directions, the five elements of yin and yang, the sixty jiazi, the seven-yuan calendar, the eight trigrams and the nine palaces, and the first month of the water calendar.

As soon as Professor Yan finished chatting with his students, he turned his head and asked me, "Nephew Erdouxian, what is wrong with the old man's opinion?" ”

In fact, I also understand Professor Yan's thoughts when he said this. He wanted to throw out a stubble and find a step to ease the embarrassing situation between the two of us.

But his seemingly modest gesture made me blush. Let me feel that this old thing is sincerity, if Lao Tzu knows, he still needs to let Geng whisper to fan you?

I ignored his stubble, got up and looked at my watch, it was almost time to rest, it was time to go to the Tomb of the Witch of Yaru.

Then I shouted at everyone to tidy up the equipment, and everyone who brought a handle should follow me to set up a climbing lock, the old and weak, women and children, and temporarily recuperate, so as not to drag on for a while!

Before I left, I reiterated my discipline. After a while, when you go down this river, you will encounter a big event, and no one can make any more assertions and act privately. If you provoke the cat and poke out the Tao, don't blame me Zhao Erdou for being ruthless and not recognizing people with guns!