This example reproduces a Sol LeWitt art piece using D3 v3 and SVG. It renders a grid of 100 horizontal and 100 vertical rectangles, each 10 pixels thick and spaced 20 pixels apart, covering the full window. Two SVG masks define a central circular aperture: the first mask reveals horizontal stripes inside the circle, while the second reveals vertical stripes outside it, creating a contrasting geometric pattern. The code uses `d3.select`, `d3.range`, and chained `.attr` calls to generate the shapes, with data bounds derived from the window dimensions.