This example reproduces a Sol LeWitt artwork using procedural SVG rendering. It displays a grid of horizontal and vertical stripes that intersect within two circular masks, creating a geometric pattern where lines are visible only inside the circles. The code generates 100 rectangles in each direction, using SVG `mask` elements with `circle` shapes to constrain the drawn areas. A full-screen SVG canvas is built dynamically with `createElementNS`, and the composition is generated entirely through JavaScript without external libraries.