This example reproduces a Sol LeWitt art piece using raw SVG and JavaScript. It shows a grid of overlapping horizontal and vertical bands, where a circular area in the center is masked to reveal only the vertical lines, while the outer region displays only the horizontal ones. The code builds the SVG via `document.createElementNS`, creates two SVG `<mask>` elements with circle and rect primitives to control visibility, and renders 100 rectangles per axis. No external libraries are used; the rendering entirely relies on native browser SVG APIs.