This example reproduces a Sol LeWitt-style geometric composition, displaying a grid of parallel horizontal and vertical stripes that intersect within a circular aperture at the center of the viewport. It shows a masked pattern where thick colored bars are selectively revealed or hidden by two complementary circular masks. The code builds the visualization using raw SVG elements created via the DOM API, including `document.createElementNS`, and applies masks (`<mask>`) with `<rect>` and `<circle>` shapes to control which stripes appear. No external libraries or data sources are used; the rendering relies entirely on procedural generation with fixed dimensions.