This example reproduces a Sol LeWitt-inspired geometric pattern using D3 v6 and SVG rendering. It displays a grid of horizontal and vertical rectangles overlaid with two circular masks, creating a layered, minimalist composition of intersecting lines and a central void. The visualization uses `d3.select`, `d3.range`, and `.join()` to generate 100 rectangles in each orientation, while SVG `<mask>` elements define the circular cutouts. The `circle-mask` uses a black background with a white circle, while `circle-mask-2` inverts the effect, producing contrasting visual regions across the full viewport.