This example reproduces a Sol LeWitt-style drawing using D3 v7, generating a grid of horizontal and vertical striped rectangles that are obscured by two circular masks. The SVG output is created with `d3.select`, `d3.range`, and `d3.symbol` to render geometric shapes, while the masks—defined via SVG `<mask>` elements—use circles filled with contrasting colors to reveal or hide portions of the grid. The artwork is rendered as an SVG, with the initial view showing only the first mask applied, leaving the second mask definition unused.