This example generates a geometric animation using raw SVG polygons, constructing 60 quadrilateral shapes that shrink and shift diagonally across the viewport. Each polygon’s vertices are calculated from a moving center point, with size and position modified by index-based formulas. The code uses the DOM `document.createElementNS` API to append SVG elements directly—no D3 library is imported—and applies a rainbow stroke color via HSL values that increment per shape. The page fills the entire browser window with a black background, rendering the hollow outlines without fill.