I was reading The Tao Of Gung Fu by Bruce Lee. I was interested in the paper tent gung fu but i did not entirly understand it. I got the picture that you make a rectangular paper box and hold the string in one hand and as you punch with the other you rotate your hips and this should pull the box towards you. I dont think this is entirly it. can some one else please ellaborate? (tried google search)