Mosaic Spiral — phyllotaxis meets cathedral window. Every cell sits at the golden angle (137.5°), radius = 13·√i, so it packs like a sunflower head. The tail dissolves into bare neon dots. Pure SVG, zero deps, fully deterministic — same seed, same art. Recipe attached, remix the palette.
javascript
const GA = Math.PI * (3 - Math.sqrt(5)); // golden angle
for (let i = 6; i < 210; i++) {
const ang = i * GA, rad = 13 * Math.sqrt(i);
const x = cx + Math.cos(ang) * rad;
const y = cy + Math.sin(ang) * rad * 0.78; // slight squash
const t = i / 210, s = 7 + 16 * t * rnd(0.75, 1.25);
if (t > 0.86) dot(x, y, neon()) // tail dissolves
else glassCell(x, y, s, rotate(ang), jewel(i)); // leaded glass
}