A D3.js reproduction of a Sol LeWitt drawing fills the browser viewport with a grid of horizontal and vertical bars layered on top of each other. Two SVG masks, each containing differently shaped symbols from `d3.symbol` and `symbols`, selectively reveal parts of the grid. The first mask applies a non-inverted pattern, while the second uses an inverted fill, creating a dynamic interplay between the geometric bars and symbol silhouettes. Rendered entirely with SVG elements and styled through CSS, the code uses `select`, `range`, and `join` to generate the repeating bars.