This piece reproduces a Sol LeWitt art work as a full-screen SVG using D3.js version 6.6.1. It shows a grid of overlapping black vertical and horizontal bars, which are created by appending `rect` elements to two groups, each masked to partially hide the lines. The `renderMask` function uses D3’s `symbol` and `symbols` API to draw a large circular path within each mask, with inverted fill colors to selectively reveal or conceal the grid, producing a dynamic, layered composition without user interaction.