This example reproduces a Sol LeWitt-inspired geometric composition using D3 to generate overlapping striped rectangles and symbol-based masks. The visualization shows a grid of horizontal and vertical bars filtered through two inverted mask layers, each containing a row of D3’s built-in symbol shapes (circles, crosses, diamonds, squares, stars, triangles, and wye). The code uses `d3.select`, `d3.range`, `d3.symbol`, and `d3.symbols` to construct SVG elements dynamically, rendering directly into the browser window with no external data source.