The basic mechanism
The basic mechanism is simple: a casting method generates a six-line figure called a hexagram, and that figure is then interpreted through the I Ching text and its symbolic structure. The hexagram is the oracle's answer to the question as it stands now.
The system works because the symbols are patterned, not arbitrary. Each hexagram belongs to a wider field of meanings grounded in trigrams, line positions, and the movement of yin and yang.