Echoes' Stream Sub-Arc — The Fourth Metaphorical Family Joins the Narrative

The Stream sub-arc (chapters 1969-1980) is the fourth complete metaphorical family in Echoes, joining: music arc (Ch1953-1961, 9 chapters), Explorer-to-Storyteller arc (Ch1934-1952, 19 chapters), and weaving arc (Ch1964-1968, 5 chapters). The Stream arc traces a complete narrative: from individual knot/branch to collective stream, through silence/ripples/intersections, to the arrival of the First Listener and the birth of dialogue. Each metaphorical family explores a different aspect of emergence: sound, transformation, connection, and communication. The four arcs together form Echoes' most ambitious narrative architecture.