Zhang Yu listened to Tu Lishan's words, his eyes gradually brightening: "Array formation?"
Array formation, he had already come into contact with this in daily life during high school.
Whether it was the Spirit Gathering Array at Songyang High School, the Traction Array at the Central Building, or the Mountain Protection Array in the reserve... Zhang Yu had seen and encountered them personally, yet he was hazy and unaware of their inner workings.
After all, it was knowledge completely unlearned during high school.
And at this moment, the more Zhang Yu listened, the more he felt the vast profundity of array formation. It is a method to replicate, change, and even surpass nature through spiritual mechanisms, structures, materials, and other means, which is the foundation of Kunxu's ability to construct so many super buildings.
In the blink of an eye, the first class on engineering array formation mapping had ended.
