This example generates a grid of horizontal and vertical stripes across the full viewport, overlaid with two opposing masks that reveal a diamond-shaped symbol at the center. The SVG is built using D3 selections and data joins, with lines spaced every 20 pixels. A reusable `renderMask` function creates the masks, using D3’s `symbol` and `symbols` API to draw the diamond path. The stripes are clipped by these masks, producing an interplay of light and dark regions inspired by Sol LeWitt’s generative wall drawings.