Note f90 — HISTORY OF ZEN BUDDHISM FROM BODHI-DHARMA TO HUI-NENG (YENO) (520 A.D.–713 A.D.)
Reading edition
As I stated before, there is a confusion between Dharma’s mien-pi habit of sitting and his doctrine of the pi-kuan meditation. The confusion dates quite early, and even at the time of the author of the Records the original meaning of pi-kuan, wall-contemplation, must have been lost.