This example reproduces a Sol LeWitt wall drawing as an interactive SVG visualization. Two sets of thin horizontal and vertical rectangles are drawn on a full-window canvas, with circular masks (drawn via D3 masks) applied to reveal a central circular region where the lines intersect. It uses D3 v3's `select`, `append`, and data joins with `range` to generate 100 strips in each direction. The rendering is pure SVG, with masks defining the visible geometry.