This example reproduces a Sol LeWitt art piece as an interactive SVG visualization. It renders a grid of horizontal and vertical bands that are masked by circular shapes, creating a dynamic geometric pattern. The code uses D3's `select` and `append` methods to build the SVG element and its components. It leverages the `mask` attribute with defined `circle-mask` and `circle-mask-2` elements to selectively reveal or hide the lines. The visualization is generated entirely through procedural code, with no external data source, and displays its pattern across the full browser window.