Week 3: Doubling the Line

Bigrams and the logic of combination

8 March 2027

Combinatorial growth from one line to four bigrams, the arithmetic that will reappear at eight trigrams and sixty-four hexagrams, and a naming caution worth flagging early rather than after it causes confusion.

Outline#

• the four bigrams (Sixiang) generated by stacking a second line
• the doubling arithmetic: 2, 4, 8, … 64 — same rule, more lines
• caution: “Sixiang” here is the bigram sense, not the unrelated Four Symbols direction-guardian tradition