This example reproduces a Sol LeWitt wall drawing using D3.js, rendering 100 horizontal and 100 vertical bars in an SVG. The bars are masked by two circular masks with inverted fills, creating a crosshatched grid that appears only within the intersecting circular regions. The visualization uses D3's `select`, `append`, `attr`, `data`, `range`, and `join` APIs to build the SVG structure and apply the mask attributes.