Harmonic patterns are coincidential patterns that perpetuate in a culture without active effort. For example, speaking about sex in a mixed sauna may sometimes be considered a faux pas that disturbs the harmony of the sauna. Or being nakes at one's home without curtains on the window when it's dark - it's legal if it's not intended for other's to see, but it's considered disharmonious. Androgyny may sometimes be considered disharmonious.
Harmony means people behaving so that they don't disturb each other without active effort to do so. It involves not littering and not habitually using profane language, and being sensitive to the feelings of others.