In the Zhuangzi, Confucius’s disciple Yan Hui reports that he has forgotten rites, then benevolence, then simply sits and forgets, dropping limbs and intellect until he is one with the great thoroughfare. Later Daoists developed zuowang into a meditation practice.
Zuowang
Sitting and forgetting: the Daoist meditation of letting go of body, knowledge and self to merge with the Dao.
Also: sitting in forgetfulness