This example reproduces a Sol LeWitt-inspired drawing using only SVG shapes. It shows a grid of thin horizontal and vertical rectangles overlaid on the full viewport, with a circular mask creating a central aperture. The code uses the raw DOM API via `document.createElementNS` to build the SVG, `mask` elements to define clipping regions, and `rect` elements for the grid lines. Two complementary masks isolate the horizontal and vertical strokes, producing a clean intersection effect. No external libraries are used; the rendering relies entirely on native SVG attributes and JavaScript.