Some people call Tai Chi Chuan an "inside family fist". There are three reasons for doing so. First of all, Confucianism discriminates against foreign influences. Secondly, the Tai Chi Chuan technique concentrates upon grabbing the joints of the opponent;s body so that whatever bodily harm that is inflicted is internal and invisible to the opponent. Third of al, Tai Chi Chuan concentrates upon directing the chi to circulate inside the body.