This example generates a grid of horizontal and vertical rectangles overlaid with two masks, producing a Sol LeWitt-inspired pattern. Each mask contains a row of distinct d3 symbols (from `d3.symbols`), rendered via `d3.symbol` with a fixed size, positioned along the canvas center. The first mask uses non-inverted fill, while the second is inverted, causing the symbol shapes to cut through or reveal the striped background. The visualization relies on D3 v7’s `select`, `range`, and `join` to bind data and construct SVG elements, with masks defined and applied through custom SVG `<mask>` elements.