This example replicates a Sol LeWitt wall drawing using D3.js, rendering a grid of horizontal and vertical stripes across the full browser viewport. Two SVG masks, each containing a large circle, selectively reveal the stripes: one mask shows the lines inside the circle, while the other hides them, creating an inverted pattern. The code uses `d3.select`, `d3.range`, and `d3.symbol` to construct the overlapping line groups and circular mask shapes, with the SVG output generated dynamically from JavaScript.