This example reproduces a Sol LeWitt art piece using D3.js and SVG. It generates a grid of horizontal and vertical rectangles, then applies two masks that shape the visible pattern. The masks are created with D3’s `symbol` and `symbols` APIs, placing geometric symbols in alternating black-and-white fills to selectively hide or reveal parts of the grid. The code uses `select`, `range`, and `.join()` to efficiently render the elements, with the rendering confined to the full browser viewport.