先天卦配河圖之象 Pre-Trigrams x HE-TU

啓蒙附論曰圖之左方陽内隂外即先天之震離兌乾陽長而隂消也其右方隂内陽外即先天之巽坎艮坤隂長而陽消也蓋所以象二氣之交運也

The Qimeng Fulu (Supplementary Commentary on Enlightenment) _ctext states:

In HE-TU

• the left side represents YANG</sub> on the inside and ⚋_YIN on the outside, corresponding to the Pre-Natal 8-Trigrams of ☳_THUNDER, ☲_FIRE, ☱_LAKE, and ☰_HEAVEN, where ⚊_YANG increases while ⚋_YIN diminishes.
• the right side represents ⚋_YIN on the inside and ⚊_YANG on the outside, corresponding to the Pre-Natal 8-Trigrams of ☴_WIND, ☵_WATER, ☶_MOUNTAIN, and ☷_EARTH, where ⚋_YIN increases while ⚊_YANG diminishes.
• This arrangement symbolizes the cyclical interaction of the two energies (⚋_YIN and ⚊_YANG) in their continuous transformation and movement.