This example shows a phyllotaxis layout of 1000 circles, arranged in a spiral pattern and colored with a warm sequential scale. An animated circle cycles through the layout, temporarily becoming transparent. The Svelte component uses D3’s `scaleSequential` and `interpolateWarm` for coloring, while a custom `layoutPhyllotaxis` utility calculates positions using the irrational number (9 + √221)/10 for angle spacing. Circles render as SVG elements with a CSS transition on opacity, creating a pulsing highlight effect.