This example creates a generative geometric composition inspired by Sol LeWitt using vanilla JavaScript and SVG. It renders 100 vertical and 100 horizontal rectangular strips, each 10 pixels wide or tall, across the full viewport. The strips are masked using two SVG `mask` elements: a circle mask for horizontal rectangles and a rectangle mask with a circular hole for vertical ones. The result is a grid of lines that appears only within a central circle, with the surrounding area showing the full-width vertical stripes. The code builds all elements dynamically via `document.createElementNS`.