"It can fly!?"
Everyone in the room widened their eyes, looking utterly incredulous.
The Third Kazekage took a deep breath and tentatively asked, "When you say 'can fly', you mean the entire city?"
"Exactly."
"That's impossible!"
Getting a clear answer, Chiyo reacted as if hearing something utterly absurd, exclaiming, "Do you know how big our Sunagakure is?"
"Since I designed the city, I naturally investigated relevant data." Ryuji shrugged. "Approximately over three thousand square kilometers."
What's the concept of over three thousand square kilometers?
That's about half the size of Hawaii's landmass.
Yes, you heard that right.
Sunagakure, which is considered small-scale among villages, is actually about half the size of Hawaii.
Shinobi Villages... although named 'villages', in terms of both population and area, they are actually city-scale.
The largest Shinobi Village, Konoha, is almost as big as Hawaii. For a city this large, if someone told you it could fly, would you believe it?
At least Chiyo certainly didn't.
No, no one present believed it.
"Since you know the city is this large, how dare you say it can fly?" Chiyo stood up, questioning. "Mechanical engineering... to put it bluntly, it's a technology that saves manpower, achieving great things with minimal effort."
"But no matter how minimal, it requires a source that meets the triggering conditions. The larger the object, the more massive the source required."
"Windmills need wind to turn; waterwheels rely on flowing water... What are you going to use to make this city fly?"
"Tailed Beasts?"
"I'm afraid even that wouldn't be enough!"
"No, the Chakra of a Tailed Beast is completely sufficient." Ryuji straightened up and explained with a smile, "When designing the Mechanical City, I incorporated spatial science. This city is crater-shaped, distributed from low to high into residential zones, military zones, administrative zones, commercial zones, agricultural zones, industrial zones, waste disposal zones... Although the total area is reduced by over a thousand square kilometers, the living space for people is actually larger. It would still be sufficient even if the population doubled in the future."
"This... I don't quite understand." The Third Kazekage questioned doubtfully, "If the total area is reduced by two-thirds, why is the living space larger? And what does this 'spatial science' mean?"
Hearing this, the others also looked over.
Not only did the Third Kazekage not understand; they were also quite confused.
Seeing this, Ryuji opened his mouth, then finally let out a deep sigh.
"Spatial science is a real-world principle I've summarized. It's like the rooms each of you have. If furniture is placed randomly, the room becomes messy and the usable area shrinks. But if arranged neatly and orderly, much extra space is freed up. I term this phenomenon 'spatial science.'"
'Ah! That's it?'
Everyone was a bit dumbfounded.
When they heard Ryuji mention 'spatial science' earlier, they thought it was some lofty theoretical knowledge related to Space-Time Ninjutsu or something.
Turns out it's just a common phenomenon in daily life.
At the same time, they also felt skeptical.
"But no matter how rationally you plan, freeing up two-thirds of the space is too exaggerated. I often organize my home but has never cleared out that much extra space."
"How big is your home? How big is a city? And have you ever used formulas to achieve the most scientific spatial allocation?" Ryuji rolled his eyes, interrupting Chiyo, who was about to say something else, with a somewhat annoyed tone. "Anyway, there's no need to question this aspect. Those who understand, understand. Those who don't, no amount of explanation will help. The blueprints are all here. Look at them carefully, ponder them deeply."
Hearing this, Chiyo immediately closed her mouth.
Since the other party had put it this way, if she kept arguing stubbornly and later the thing was actually built exactly as described, wouldn't that just prove her own ignorance?
"Because the area is reduced, the required energy consumption also decreases exponentially. Moreover..." Ryuji continued explaining, "Just as windmills only need wind to turn and waterwheels only need flowing water to operate, most mechanisms within the city are designed to operate relying on natural forces. The actual consumption is far smaller than imagined."
Using nature as the power source is precisely the remarkable aspect of the Mechanical City.
According to records about the Mechanical City in the Mozi, this city is built against mountains, utilizing steep cliffs and mechanical engineering as defensive advantages.
It uses nature's wind, water, and sunlight to meet all the city's operational needs, capable of self-sufficiency for hundreds of years.
But Ryuji's Mechanical City is different.
The Land of Wind simply doesn't have a suitable place to build such a Mechanical City. The existence of Shinobi, these supernatural beings, also makes the Mechanical City's defense less reliable.
It might not even compare to Sunagakure's natural barriers.
If Ryuji built the Mechanical City exactly as recorded in the Mozi, it would be meaningless.
So, he made modifications.
Based on the theory of the Mechanical City from the Mozi, assisted by alchemy recorded in Golems and Dragons, combined with various mechanical and supernatural technologies from other worlds, he finally devised this plan.
Such a city is completely different from the original Mechanical City and cannot rely solely on nature as an energy source.
"In fact, although Tailed Beasts could serve as a sufficient energy source, I didn't plan to use Tailed Beasts as the power source." Ryuji continued, "No matter how everyone views Tailed Beasts, they all have their own consciousness and thoughts. They are intelligent beings equal to humans. I get along quite well with Shukaku, so how could I bear to use them as batteries?"
"Couldn't bear to?"
Everyone present couldn't help but want to laugh.
A certain someone who, at eight years old, went to the Kazekage's office to request researching Tailed Beast's Chakra, then regularly visited the prison to ask Bunpuku to store Chakra into scrolls… this guy actually has the nerve to say here that he couldn't bear to use Tailed Beasts as batteries.
They really wanted to point at Ryuji's nose and shout: I've never seen someone so shameless.
But since they were discussing serious matters, no one exposed this point.
The Third Kazekage asked, "But if not using Tailed Beasts as the energy source, what will your Mechanical City rely on for power?"
"I thought about this problem when I first had the idea of designing the Mechanical City." Ryuji took out two scrolls and spread them on the table.
These were recording scrolls, densely filled with lots of information.
"The Gelel Stone, a type of ore containing immense Chakra. According to historical records, ancient people established and used this ore to build a great civilization." Ryuji pointed at one scroll. "Over the years, I've been conducting investigations. That ancient city truly exists. The city's energy source was the Gelel Stone, and it's located at the border between the Land of Wind and the Land of Rivers. Beneath the city, there is a Gelel Stone Vein."
"Moreover, I have already found someone who knows relevant clues."
"As long as we find that person, we might locate the vein."