This D3.js example reproduces a Sol LeWitt wall drawing using generated SVG rects and masks. It creates two circular masks over a grid of horizontal and vertical bars, with one mask inverting the circle to show a ring pattern. The visualization uses native SVG mask elements and the d3 selection API, though the rendering is primarily procedural JavaScript manipulating the DOM. The piece fills the browser window dynamically using window dimensions, generating 100 rects in each orientation.