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  The spindle-shaped perceptual vortex in Chen Mu's body was constantly rotating, and its volume had almost doubled compared to when it was first formed.

  This was Chen Mu's thirty-third experiment on the sensory perception within his body. His experimental steps were divided very finely. Under different rotational speeds, the characteristics exhibited by the spindle-shaped vortex of sensory perception, he had made extremely detailed and thorough explorations.

  Judging from the current results, he divided the rotation speed of the spiral vortex in his body into three stages: low-speed stage, medium-speed stage and high-speed stage. Each stage is further divided into five layers.

  He is now in the fifth stage of the high-speed phase, at this speed, almost all the sensory threads are mobilized, tens of thousands of sensory threads shoot out from his body and disperse into the surrounding air. Affected by this, his six senses become more acute than ever before.

  These perceptive threads extended to 4.9 meters before stopping. This is also the farthest distance his perception can reach now, and he has been unable to break through five meters. These invisible perceptive threads floated around his body, like small tentacles, extremely sensitive, capturing even the slightest vibrations of perception from afar.

  This is already the limit speed he can control. From the results of his current experiment, the faster the spindle-shaped perceptual vortex spins, the more perceptual threads are ejected.

  If he continued to increase his speed, what changes would occur? He was hesitant and didn't know if it would produce any adverse reactions. If he accelerated again, it would exceed the range that he could control.

  He denied it was his own idea for this adventure, but rather what prompted the vortex of arrow-like perceptions to gradually slow down.

  The extension range of the sensory filaments reached 4.9 meters and could not continue to extend, which had been troubling him. He still hasn't found the factor that determines the length of the sensory filaments. The rotation speed of the spindle-shaped sensory vortex determines the number of sensory filaments ejected, the faster the speed, the more sensory filaments are ejected, and vice versa, the fewer.

  But what affects the length of the extended sensory cilia?

  Unconsciously, the rotation speed of the spindle-shaped perceptual vortex slowed down, and soon it approached the low-speed layer. This is the slowest speed at which the spindle-shaped perceptual vortex rotates in a spontaneous state. In normal states, it will always maintain this rotational speed.

  Suddenly, Chen Mu realized that he had neglected a very important issue. He had been accelerating the spindle-shaped perceptual vortex all along, but never thought of slowing it down.

  What changes will occur in the vortex of perception when decelerating? Chen Mu became somewhat curious.

  The spindle-shaped vortex quickly recovered to its original rotational speed, and Chen Mu began to reverse control its rotation. Indeed, it was feasible, Chen Mu secretly rejoiced in his heart, and its speed gradually slowed down.

  Chen Mu did not dare to be careless and carefully sensed every change in the vortex of the spindle-shaped perception.

  The speed was getting slower and the scattered perception threads were rapidly decreasing. In a short period of time, only about a hundred or so scattered perception threads remained around Chen Mu's body. Chen Mu tried to control one of them, wanting to see what changes had occurred.

  He soon came to the conclusion that as his sensory threads decreased, his control over them was rapidly increasing.

  He tried to push this sensory thread forward, and before it reached this length, the sensory thread had already reached its limit. The spindle-shaped vortex would give it a strong inward pull, preventing it from extending further.

  However, this time, this thread of perception moved! It stretched forward quickly, and Chen Mu didn't feel the original pulling force.

  Chen Mu was stunned and froze for a moment.

  The out-of-control, tapered perceptual whirlpool snapped back to its original speed, that familiar traction reappeared, and the sensory threads retreated back to 4.9 meters.

  Chen Mu's face lit up with an uncontrollable excitement. He was certain that in the previous moment, the thread of perception had absolutely broken through the five-meter mark!

  It took him a full ten minutes to calm down again. Suppressing his excitement, he struggled to keep himself calm. He began to carefully control the vortex of sensations, slowing it down, and then, just like before, the same situation occurred again.

  Five meters! His perception range finally broke through the five-meter mark! He had finally met the requirements on the mysterious card. It had been a long time since he had created the simple Water World with twelve cards.

  He didn't relax but continued experimenting.

  Soon, he found the law. The slower the spindle-shaped perceptual vortex rotated, the fewer the number of perceptual threads that could be released, but the length to which these perceptual threads could extend was greatly increased. Moreover, Chen Mu also discovered that not only in terms of extension length, but also in other aspects of control over these perceptual threads, it was more handy.

  However, slowing down the speed of the spindle-shaped perceptual vortex is also dangerous. As the speed gradually decreases and approaches a certain critical value, the spindle-shaped perceptual vortex begins to show signs of instability. Chen Mu speculated that if the speed continues to decrease, the spindle-shaped perceptual vortex may collapse.

  Chen Mu also obtained a new data, his perception thread can extend to the highest length of 6.2 meters, which has far exceeded the simple water world's requirement of 5 meters.

  It was so simple! Chen Mu smiled wryly, he had been stuck on this point for such a long time, only because he hadn't thought of it.

  He felt as if his understanding of perception had suddenly risen to a new level, and he was more in control of his senses. The vortex of perception within him also changed again, its initial speed disappearing, instead fluctuating with Chen Mu's changing control.

  Chen Mu controlled its rotational speed more at will, but every time it approached the two critical values of high and low, he felt a sense of warning. It seemed that his perception had also made his intuition more acute.

  Breaking through the five-meter mark means he can trigger the next level of the mysterious card. He doesn't know what kind of surprise the mysterious card will bring to him, and he can't help but feel a little excited.

  He hasn't undergone professional evaluation, so he isn't clear about his own perception either.

  He took out the mysterious card, tore off the camouflage film on it, and inserted it into his wrist-mounted meter. He once again entered the familiar simple water world.

  Without hesitation, he slowed down the speed of the spindle-shaped sensory vortex to its lowest point. Dozens of 6.2-meter-long sensory threads were scattered around his body.

  "Congratulations, your perception has broken through five meters." The old and calm voice sounded again beside Chen Mu's ear.

  "The arrowfish challenge is not yet complete, will it enter the next round?" The second sentence made Chen Mu a bit silly, at this time, he reminded himself that the arrowfish challenge was not yet complete. Is the arrowfish challenge important? Or once entering the next round, the arrowfish challenge will be gone?

  He hesitated for a moment.

  Is it or isn't entering the next round? Every day, he persisted in bitter practice, enduring immense suffering, wasn't it all just to see what the next round would be like? And now, the opportunity is right before his eyes, yet it also gave him an unexpected reminder. But if he chooses not to, will there also be some irreversible changes?

  Every sentence of this old voice, even every word, he didn't dare to be careless. This is the most important and most intuitive clue provided by this mysterious card for itself. Only by carefully analyzing the meaning contained in these words can he make a relatively accurate choice that is more beneficial to himself.

  After thinking for over ten minutes, he decided to choose no.

  What a relief it was for him that, apart from the disappearance of that hoarse voice, the simple water world remained just as it had always been, without any difference.

  After leaving the simple water world, Chen Mu only felt a sense of fear afterwards. If an irreversible change had occurred just now, he didn't know how much regret he would have. Fortunately, his luck was good this time and he had gambled correctly!

  Next, he was left with only the arrowfish challenge! Chen Mu's spirit was lifted, and his whole body seemed to be filled with power.

  He put down all his work temporarily, except for the unshakeable physical exercise and sensory training. The rest of the time was spent on the arrowfish challenge. Fortunately, he had an arrowfish training card, otherwise, he would have been injured dozens of times by now. That needle-like pain was still fresh in his memory.

  Every day, Chen Mu made rapid progress in his training with the arrow fish, constantly running and dodging. However, what he didn't expect was that perception would play a crucial role!

  The longer the sensory filaments are, the farther away they can feel the fluctuations, and the more sensory filaments there are, the more sensitive they are to changes around them.

  Especially the second point, it's too important for him! While maintaining the high-speed rotation of the spindle-shaped sensory vortex, he can feel any subtle changes in the surrounding water flow. And usually, although also can feel, but far less clear than this situation.

  The only problem now is how to maintain stable control over perception while running and dodging.

  Could it be that these trainings in the simple water world are actually connected to each other? Sometimes Chen Mu would also occasionally have this idea.

  As long as he finds his target and method, it's not a particularly difficult problem for Chen Mu. He has enough willpower and perseverance to complete it.

  For fifteen consecutive days of arrowfish training, Chen Mu maintained control over his senses at all times, whether eating or doing other things.

  The effect was very satisfactory, and on the 15th day, he had already completed the training of the arrow fish with a probability of seventy-five percent. Such a complex challenge, any tiny factor can be a decisive factor. To achieve one hundred percent, it is basically impossible for Chen Mu now.

  He is already very satisfied with this achievement.

  After resting for a day and letting his body recover to its best state, Chen Mu prepared to enter the Simple Water World to challenge the Arrow Fish.

  Before he could take out the mysterious card, suddenly, a knock at the door sounded.

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