Legend has it that tai chi was invented by a man with the surname of cheung and a nickname of three winds, refering to his regular three bouts of madness everyday. this man eventually settled on wundang mountain and sat at the head of the taoist temple for a verrrry long time. His kung fu was the kung fu of the wundang school of martial arts; school of refering to the style of the place, the temple was not a school. Hence, wundang=tai chi.