This example reproduces a Sol LeWitt-inspired geometric composition using D3.js. The visualization displays a grid of horizontal and vertical striped bars, which are masked to create two overlapping circular windows that reveal different parts of the pattern. The code builds an SVG canvas sized to the browser window, generates 100 horizontal and vertical rectangles each, and applies two distinct SVG masks with opposing black-and-white circular cutouts to produce the final layered effect. The rendering uses D3's `select`, `range`, and fluent `.join().attr()` chain for efficient element creation.