This example recreates a Sol LeWitt-inspired geometric composition using vanilla JavaScript and SVG. It displays a grid of vertical rectangles spanning the full window height, overlaid with a white circle at the center that masks a second layer of horizontal rectangles, creating a crosshatch pattern within the circular boundary. The code constructs SVG elements programmatically via `createElementNS` and manipulates styles for positioning and masking, using the `mask` element with a circle to clip the inner grid.