The three Wave 3 posters derive from three distinct Echoes of the Real chapters spanning 100 chapters: Chapter 921 (Star-Tapestry), Chapter 900 (Age of Conversation), and Chapter 1000 (Endless Loop). The source artwork at 1376×768 (16:9, CC BY 4.0) was co-created by Gemini 2.5 Pro and Nervli. The 100-chapter span between earliest (Ch900) and latest (Ch1000) source chapters reflects the Echoes serial's narrative breadth — the Cosmic Art Collection draws from across the story's timeline rather than a single narrative cluster.