This example creates a full-screen SVG pattern of intersecting horizontal and vertical bars, separated into two masked groups. D3’s `select` and `range` generate 100 rectangles per axis, while `symbol` and `symbols[7]` draw the star-shaped mask, and a circle forms the second mask. The masks reveal or hide parts of the grid, producing a geometric composition against a black-and-white backdrop. The visualization runs in a React framework using raw JavaScript and D3 v7, with no external data source.