This example reproduces a Sol LeWitt-style geometric composition using D3. It displays a grid of horizontal and vertical bars overlaid with two circular masks, creating a crosshatched pattern that alternates visibility within and outside the circles. The code uses D3 selections, `range()`, and SVG masks (`mask` elements) to generate the repeating rectangles. It employs `d3.select`, `append`, and `attr` with data-driven joins, rendering entirely as SVG in the browser. The art piece is recreated computationally, with the layout determined by the window dimensions.