This example reproduces a Sol LeWitt art piece using D3 version 7. It displays a grid of horizontal and vertical lines overlaid with two masks, each containing a row of distinct geometric symbols. The horizontal lines are masked by one set of symbols, while the vertical lines are masked by an inverted set, creating a layered, intertwined visual effect. The code uses `d3.select`, `d3.range`, and `d3.symbol` to generate SVG shapes and `append('mask')` to apply the masking logic dynamically.