Bai Shi is a form of authenticity of wing chun, as Bai Shi has always been passed down traditionally. It is an official acknowledgement for Wing Chun lineage that the disciple has learnt.  It's about preserving a tradition - passing a legacy from father to son, from teacher to student. Some traditions may mean family rituals practiced during the holidays or at special occasions such as a birth, marriage, or death. It may involve the family's religious practices and may include food that the entire family recognizes as part of its heritage. Bai Shi, a ceremony with ritual elements conducted by a master in whom one or more students "enter the door" to become disciples, involves all of these and more. It honors a unique bond - and respect - between Master and student. With the conclusion of the Bai Shi ceremony, the student and Master are connected through an "adoption" or a formal extension of his family unit, in which the "inner door student" is officially recognized as the next generation in the lineage of the Master.