"Don't you want to explain what visual error is?" Xuan Xunxue was a little unrelenting, she didn't think that Li Chengqian, who could understand visual errors in an instant, would not know anything.

I didn't want Li Chengqian to retort with confidence: "Visual error is visual error, how can this be explained?" ”

In his opinion, since Li Jingxian and Xuan Xunxue can understand various weather environments that will affect people's eyesight, they should naturally understand what visual errors are. And now that they have understood, there is no need to explain what visual error is.

It's like 'go', everybody is talking about where to go, from who needs to explain what 'go' means, because it's already common sense that everyone knows, and it doesn't need to be explained at all.

"So can you give an example of a visual error?" Li Jingxian came back to his senses from the complaint, and he didn't quite believe that Li Chengqian would only know the word visual error, but not the specific details.

Examples? Li Chengqian thought about it, this Tao is simple, and there are many visually incorrect graphics in later generations, and it is no problem to make one that is used to bluff people.

……

A piece of white paper, six or forty-eight black squares of equal size, each square has an equal distance between them, and after finishing it, Li Chengqian lifted the white paper and put it in front of Xiao Daogu's eyes: "There are a few black dots in here." ”

"How many black dots?" Xiao Daogu was a little puzzled, this picture was drawn by her looking at Li Chengqian, and there were no black dots on it at all.

But when she fixed her eyes on the picture, her face changed.

Because there are really a lot of black dots on the picture, but they are not in the center of the gaze, but in the afterglow.

There is a small black dot in the middle of each of the four black squares, which is clearly visible in the afterglow, but if you look over, you will find that there is nothing there, only a cross-shaped blank space.

Li Jingxian noticed the change in Xiao Daogu's face and poked her head curiously.

However, from his point of view, he didn't find anything special, more than forty black squares, one of which was not much, one was not many, and as for the black spots, there was no such thing as black spots at all.

Just as he wanted to speak, Li Chengqian turned the paper in another direction, turned his face towards him, and asked the same way: "How many black dots are there here?" ”

"Where is there any black ......" Halfway through the words, Li Jingxian also paused.

When he looked at the picture from the front, he finally knew why Xuan Xunxue's face was so ugly, because he saw the same thing as Xuan Xunxue.

……

"Where did you learn this thing? As far as the old man knows, there are very few people who can do this thing. The paper used to prove the visual error was put aside, and Li Jingxian's expression was extremely serious.

It is true that he wants to accept Li Chengqian as an apprentice, but if Li Chengqian already has a teacher, then it is a taboo for him to do so, and if Li Chengqian is a disciple of an old friend, I am afraid that everyone will not be able to meet in the future.

But to the old man's surprise, Li Chengqian's eyes just widened curiously: "This is Qimen?" Do you still have to learn this thing? ”

Don't you want to learn? How could it be impossible to draw such a thing? Li Jingxian and Xuan Xunxue glanced at each other, and it was obvious that the two did not understand the point of Li Chengqian's words.

In fact, what Xiao Li is really curious about is 'Qimen', as for whether to learn ......, the visual error map will not be too much in the future generations, even if it is, he will remember one or two simple pictures.

The misunderstanding became deeper and deeper, and Li Chengqian didn't know that he had been regarded by Li Jingxian as a genius, a genius who was born to know. And Li Jingxian didn't know that the genius in his eyes was actually copying some pictures from later generations to bluff people, and he didn't really understand the principle of visual error.

Under this misunderstanding, Li Jingxian finally made a decision that he regretted a lot: "His Royal Highness King Qin, the old man has a reluctant request, ask again before you say it, do you have any other teachers?" ”

"Do Wei Zheng and Li Gang count?" Li Chengqian thought of the prince and the prince, the prince and the young master.

"It doesn't count." Li Jingxian shook his head, he knew Wei Zheng and Li Gang very well, and knew that they were just teaching Li Chengqian some great principles of life, and did not teach him substantive things.

And they are not the same as Confucianism, and they have nothing to do with each other, so it doesn't matter if they rob apprentices.

"If it doesn't count, then it doesn't." Li Chengqian shook his head.

He didn't know what Li Jingxian, the old man, wanted to do, and planned to probe his bottom.

Li Jingxian took a deep breath and finally made up her mind: "His Royal Highness the King of Qin, the old man wants to accept you as an apprentice, I don't know what His Highness wants?" ”

"What?" Li Chengqian was momentarily stunned.

"If His Highness is unwilling, the old man will never force it!" In order not to be slapped too hard in the face, the old man Li Jingxian hurriedly said.

"No, it's not, I mean, you ......" Li Chengqian encountered this situation for the first time, countless thoughts flashed through his mind, and after a moment, he was stunned and said, "What can you teach me?" What's in it for me? ”

After apprenticing, can you call Li Ji a senior brother when you see it?

If you see your own Lao Tzu, what is your name? Second brother? It's going to be killed, right?!

Li Chengqian was pondering, but Li Jingxian was embarrassed to find that there really seemed to be nothing to teach.

This kid is already very familiar with the method of 'Qimen', and he can draw such magical pictures at will, as for other aspects, it seems that the kid doesn't use himself to teach.

Tricks? That kid can transform a pulley bow, a combined bed crossbow, and even a train that can burn coal, which is no longer something he can teach, and with that kid's ability, he can teach him the other way around.

Cultural knowledge? I heard that kid is known as 'poetry and poetry' in Chang'an City, and no one in the entire Tang Dynasty can compare to him, so this can also be removed.

How to behave in the world? There are teachers like Wei Zheng and Li Gang, and there is an old man who is the emperor, and he doesn't seem to need him to teach anything.

Marching to fight? Well, this is okay, but the problem is that this kid even wants benefits, this is the first time I've heard of it!

Didn't the master ask the apprentice for benefits before? How did it get here? I took him as an apprentice and wanted to give him benefits? Doesn't it make sense?

After hesitating, Li Jingxian regretted that the decision just now was a little hasty, but he couldn't come back after the words were spoken, so he didn't answer Li Chengqian's question, just looked at him quietly, waiting for his answer.

"That ......" Li Chengqian also seemed to realize that what he had just asked was a little inauthentic, and he thought for a while with a sad face and continued: "Otherwise, you will be a registered master for me...... No, no, I'll make you a registered disciple? Let's try the water first, if it doesn't work, then change? ”nt

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