This example reproduces a Sol LeWitt wall drawing using D3.js to generate a grid of horizontal and vertical lines. Ninety-nine horizontal rectangles and ninety-nine vertical rectangles are drawn across the full browser window, with two circular masks applied to reveal the lines only within intersecting circular regions, creating an overlapping geometric pattern. The code uses D3’s `select`, `range`, and `join` methods with the SVG renderer, and relies on the `mask` attribute to define the circular cutouts.