This is a rear view demo of the Chen style Tai Chi Chuan (Taijiquan) 27 Postures Form.  This is a form that my master and the head master of the academy, at which I was training in China, put together.  So, if you have not seen it before, that is why.   
 
http://www.AncientWisdom-APlitt.blogspot.com 
www.Andrew.PureTrim.com 
 
Enjoy!