C906 Magical Stair Design

"Soul Suspending Stairway?" Fang Rui and Yao Kexin widened their eyes at the same time, "What's that thing?"

The old man slowly searched through his memories for a while before he finally opened his mouth.

Of course, in reality, it is only a three-dimensional staircase, it is only using light, angle, and other factors to create illusions in the brain. In fact