I recreated the viral riso animation with Claude Code + Opus 5. Here's the full prompt, the process and the token count

for your own title)

    Build a 30-second procedural animation in a risograph-print style, as ONE self-contained index.html (Canvas 2D, no libraries, no network fonts, no images, no assets of any kind — every pixel is drawn by code). Make the finished animation, not a demo of techniques.
    
    The idea
    A lone ink dot calls out into the world with ripples, and everything that resonates answers back — bells, wolves, whales, radios, fireworks. It collects them as memories, but alone they fade to blue. Then a second dot, pink, answers from off-screen. Call and response. Where their ripples meet, a flower blooms, the world is reprinted in their two inks, and we pull back to a universe full of pairs. It ends on a hand-lettered signature.
    
    The spine of the whole piece: a small indigo dot pinned to the exact centre of the frame, and concentric ripple rings coming out of it. Every scene, every transition and every camera move is organised around that dot. It never drifts during Acts I–III.
    
    Format
    Square 720×720 canvas (internally render at devicePixelRatio), 28.0 s, time-based (not frame-based).
    Warm cream paper background in all