This example reproduces a Sol LeWitt-style geometric composition using D3 v7 and SVG. It layers two masks over intersecting grids: one mask reveals vertical stripes through alternating D3 symbols, while the other horizontally bands the canvas with a second symbol set. The code uses `d3.range`, `d3.symbols`, and `d3.symbol` to generate the mask shapes, then applies the masks via SVG `mask` attributes. The result combines generative patterns with minimalist grid structures, demonstrating mask-based compositing in a browser window.