Create one finished standalone photographic website background image, 21:9 ultrawide, approximately 2520 by 1080 pixels. Theme: Collective motion. Scene: Extreme wide panoramic aerial view of a sparse stream of pedestrians moving across the bottom of an immense pale paved square, crisp afternoon shadows. Art direction: Photoreal aerial editorial photography, small believable full-body adult figures, convincing shadows and spatial scale. Strong graphic composition with spacious plain architecture. No miniature toy look, no duplicated people, no text or logos. Composition: retain generous low-detail top space suitable for overlaying website copy, adapting subject placement naturally. This is the actual background artwork, not a website mockup. No text, letters, typography, logos, borders, collages, grids or watermarks. Full-bleed, polished, richly detailed at native resolution.