The six gates divide the body into upper, middle, and lower areas on the left and right sides. These gates create six simple zones. When an attack enters a particular zone, a Wing Chun practitioner simply fills the space within that zone. This way you do not need 100 different techniques to defend 100 different attacks. When you use the six gates, it does not matter what the attack is; it only matters towards which zone the attack is coming. Wing Chun practitioners use the principle of "filling space." This is science: no two objects can occupy the same space at the same time. Filling space creates angles of deflection and redirection, unlike traditional blocking (which uses strength to forcefully bat away an attack). If your punch is stronger than my block, then the punch will win. In contrast, filling space sidesteps contests of strength and physical power.