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Then the old man spoke up, as if judging a sinner, and said to Richard, "See, boy, this is what you deserve to be arrogant, arrogant, unsightly, and clever! Your curiosity is too strong, and you try to approach what you shouldn't know, and it can only be—a painful death!"

I'm telling you, mortals shouldn't be too curious, curiosity will only hurt you!"

Speaking of this, the old man's tone suddenly changed again: "Of course, out of kindness, I can give you a chance to mend your ways. As long as you promise that you will no longer be curious about things that you shouldn't be curious about in the future, and no longer explore things that shouldn't be explored, you will live your duty well. Then I can use some means to relieve your body of poisoning, and even give you a good leg. How?"

After listening to the old man's words, Richard's eyes flashed, he looked at the old man, and did not speak for a long time.

"What do you want to say?" asked the old man.

Richard still didn't speak, but looked around, at his decomposing body, at the calves that had been cut off by himself on the ground, and finally at the old man again.

"It's all illusory, isn't it?" Richard said earnestly, "I've always had a guess, but now it's almost certain." It's all some kind of very special illusion, right?"

The old man was furious and shouted: "Nonsense! What a fantasy, this is real! Why, boy, do you think you can't accept the reality anymore? Can't accept it, you have worked hard to the end, but there is a miserable ending? But this is the reality, this is the reality brought about by your curiosity!

Do you think it's an illusion? Tell me, what's fake? Look at everything around here, feel your body, do you think there's anything unreal? ”

"But I'm still skeptical. Richard said with a slight smile on his face.

The old man snorted, "But no matter how much you doubt it, this is the real world!"

"That-" Richard spoke, looking at the old man, pointing to the side, "Can you stand in that position and talk to me?"

"Huh?" the old man frowned, "why?"

"Because it's kind of strange that you don't seem to have moved at all since you appeared......"

Before Richard finished speaking, the old man walked to the place Richard pointed to, stood in front of the wall at the end of the library, and said disdainfully to Richard: "Why, do you think that what I haven't walked around is an illusion, and you think that I am some unreal projection?"

Oh, pathetic boy, accept it all, your body is crippled, toxins are spreading all over your body, and there is not much life left. If you don't ask for my forgiveness, you'll be dead. ”

"You seem to have a lot of point. Richard nodded thoughtfully, then looked at the old man and said, "And the problem is, this is indeed an illusion. Although it is very special, I can't even realize when I was hit, and I didn't feel any mana fluctuations, although it imitates any details without any problems, and I can't see any mistakes with the naked eye, but ...... What is false is what is fake. ”

"Impossible!" cried the old man, as if he had lost his temper, "is there anything wrong with this world, this real world? If your eyes can't find anything wrong, how can you say it's false?

"Of course not. Richard shook his head slowly, "I have to admit that your methods are so good that it is difficult for me to find flaws with the naked eye." But here's the problem...... Not only do I have eyes, but I also have other sensory organs, such as ears.

You do mimic the current illusion very realistically, but you can't imitate it, or you don't realize the rules of physics. So, in my perception, the current world, this library, lacks something that should exist. ”

"What?" the old man couldn't help asking.

"Echo!" Richard answered.

"Echo?" the old man was stunned, confused.

"Yes, Echo. Richard calmly explains, "When a sound wave is projected onto a large obstacle object that is some distance away from the sound source, some part of it will be absorbed and the other part will be reflected. If there is a clear time gap between a person hearing a sound coming directly from a sound source and a sound coming back from a reflected sound, he can distinguish the difference between the two sounds, that is, an echo is generated.

Generally speaking, the shortest time for humans to distinguish an echo is 0.1 seconds, and the speed of sound propagation, in the air at 15 degrees Celsius, is 340 m/s.

It's November, the cold moon, and the temperature inside the night is relatively low, but in this library, the temperature is acceptable, about 15 degrees Celsius. The width of this library is about 12.5 meters, and the length is about 22 meters. You are now standing more than 17 meters from the farthest wall, about 20 meters.

The sound comes out of your mouth and into my ears, and the time is basically negligible. But there is a 40-meter path to reach the farthest wall and then pass back, and it takes about 0.12 seconds, which is enough for me to hear an echo.

However, I didn't hear an echo. Whether it's making you change positions or stimulating you to speak out loud, echoes are completely non-existent.

Obviously, this is a fantasy, a very special but indeed fictional illusion. Everything and insects are made by you, and so are the sounds, so there is no echo. ”

The old man listened to Richard's words, his expression changed little by little, although he didn't understand Richard's words, he could be sure that Richard really saw through his methods, and his eyes were uncertain.

Richard looked at the old man at this time and said, "Since it's an illusion, it's much easier." I don't know exactly how this illusion works, but it's supposed to confuse my brain and produce false electrical signals. And my brain isn't really easy to control, especially after I realize it's a false world. ”

"So—" Richard exclaimed, reaching out and slowly grabbing the rotting skin on his body, his fingers digging deep into it, and then pulling it hard.

"Sting!"

The skin was like a coat, and it was torn off raw, and I saw that there was no flesh under the skin, but new clothes.

Richard then bent down, picked up the severed calf, and aimed it at the incision. With a "snap", the two were connected as if magnetically attracted and returned to their original state.

Richard nodded in satisfaction, straightened up, and looked directly at the old man.

The old man's expression changed completely, looking at Richard, who had completely returned to normal, he had a premonition that he was out of control, a trace of surprise flashed in his eyes, his lips pursed, and he subconsciously stepped back.

：。 ：

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