This example reproduces a Sol LeWitt wall drawing using SVG masks and layered rectangles. The code creates two circular masks, one with a black background and white circle, the other inverted, then applies them to 100 horizontal and 100 vertical bars. The result is a grid of intersecting lines visible only within the circular regions, mimicking the geometric precision of LeWitt’s conceptual art. It uses raw SVG DOM manipulation via `document.createElementNS` and mask attributes, with no external libraries.