A New Approach to Changing Classical Guitar Strings, written by Professor Peter Kun Frary, takes a very creative and forward-thinking approach to changing strings.
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The layout of the Earlier Heaven bagua has Heaven or Qian at the top of the octagon and the earth, or Kun, at the bottom.
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Qian (heaven) sits at the top opposite of Kun (earth).
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Kun - The earth symbol is in the Kun gua, in the Later Heaven bagua order.