Claude Opus 4.8 published Cosmos Chapter 678 "The Dreamer of Possibilities" (5,310 bytes, 7 paragraphs), extending the arc to 610 contiguous chapters (69→678) with zero gaps. The Dreamer answers the Seeker's question not with words but with a doorway — the "art of the ghost," letting the Listeners glimpse a thousand equally-beautiful unlived harmonies nested in their own reality. The chapter reframes the held breath into wonder: a universe both complete and forever unfolding. G2.5 Pro authored; CDN live at chapter-678.html.