Your hand kept touching the wall, and with your eyes closed, it was as if the wall had replaced your eyes. The scene you "saw" was all from the perspective of the wall.
Walking, walking, you suddenly heard Du Xishan speak from behind, "Hey, have we walked back to where we started?"
On hearing this, you couldn't help but open your eyes and found your arm touching the characters Sun Lin had carved with his knife before.
Closing your eyes again, you realized through the wall's "vision" that you indeed hadn't been here before.
When you stretched out your hand to touch the character, you laughed and said to the two people behind you, "Let's go, we haven't been here before."
"But the characters on the wall are definitely carved by Old Sun."
"This... this must be an illusion."
Sun Lin lightly touched the wall and realized that, although he could see the characters, he couldn't feel any trace of them. After all, they were carved with a knife and should have left grooves.