Three beats, one story

8s · 9:16 · Original authored example, not a claimed AI generation

Make an 8-second vertical tutorial about story structure using the exact words 'Before', 'Change', 'After'. One small square begins outside a frame, moves through an opening and settles inside it. Let those same objects explain all three beats, keeping text inside mobile safe margins. The story is abstract; add no results, promises or statistics. Use a calm neutral palette and coral for the moment of change. Present a beat sheet and four keyframes before creating a single HTML file with window.DURATION = 8 and async window.seek(t); no timers, external assets or network.