The Elements Metal, Earth, Fire, Wood, Water. Wood weakens water. Earth unites water. Water extinguishes fire. Wood fears metal.   The Steps of a Kata The forward steps are metal. The back steps are wood. The left steps are fire. The right steps are water.   There are no straight lines in the Universe. Man crated straight lines. In nature energy - Ki flows in circles. Man created "Shaa" the destructive energy. An arrow comes in a straight line, A bullet comes in a straight line. The punch comes in straight. - A negative energy.   when a destructive energy comes towards you, you must turn it back. The physical part is to block the blow and return a punch, but the mental part is to block the blow and send the energy back. By O'Sensei Kim Hanshi