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Keep the central position; do not show anything substantial or insubstantial to your opponent. When s/he brings pressure on your left side, that side should be empty; this principle holds for the right side also. When s/he pushes upward or downward against you, s/he should feel as if encountering nothingness.
In advancing, let him/her experience the distance as increasing drastically. When s/he retreats, let the distance seem exasperatingly short. The entire body is so light that a feather can be felt and so pliable that a fly cannot rest without setting it in motion.