This example recreates Sol LeWitt-style geometric art using D3 v6, generating a grid of horizontal and vertical rectangles in SVG. Two masks, each containing a large D3 symbol path, cut circular holes through the intersecting lines, creating overlapping negative space. The visualization uses `d3.select`, `d3.range`, `d3.symbol`, and `d3.symbols` to construct the shapes programmatically, with masks applied via D3's selection and call methods. A third triangle symbol appears on the left, rendered with `d3.symbolTriangle`.