‘Search 周易 for all 64 trigrams.’
it is BINARY! The top Yao (爻) is the last digit and 阴爻 (--) is the digit ‘1’, and 阳爻 (—)is the digit ‘0’.
Around the circle, the series is arranged in anti-clock wise.
If we start from the bottom right corner then, 阴爻 (--) is the digit ‘0’, 阳爻 (—)is the digit ‘1’, the top Yao is the last digit where the '1' is added to.
This reversed series is arranged clockwise around the circle.
So...?