"Of course they're different. Every part of the Pipe Fortress is different."
The senior heard him muttering under his breath and immediately said to him sternly.
"How are they any different? They're all just pipes, aren't they?" He forgot all about his mission to persuade the man and confronted the senior directly.
"All pipes? That's just their physical appearance! What you see, what you hear, what you touch—it's all pipes. So you just assume that's all they are, right?" the senior demanded.
"What else, then?"
"Then you're just trapped by your own senses! Once you reach the fourth layer of the Abyss, you can't just rely on your senses to understand the world anymore. You have to search for things that lie beyond perception. Take the Pipe Fortress, for example. Do you know how it was formed?"
"No idea. I heard it was created by a relic."
