This example displays a geometric composition of triangular polygons and a central symbol, created using D3.js APIs such as `symbol`, `select`, and `attr`. The visualization renders SVG polygons against a masked region, where a rotated path shape defines the visible area. The mask includes a white rectangle and a black symbol, which is also overlaid directly on the canvas. The code generates data procedurally based on window dimensions, demonstrating a generative art approach within a React framework using the D3 library version 7.8.4.