This example generates an abstract geometric composition inspired by Sol LeWitt using D3 v6. It renders two sets of overlapping striped rectangles—horizontal and vertical—that intersect to create a grid pattern. Two SVG masks define a central circular region where the horizontal stripes remain visible while the vertical stripes are hidden, producing a contrasting visual effect. The code uses `d3.select`, `d3.range`, and `join` to bind data to SVG `<rect>` elements, with mask attributes controlling visibility.