This example reproduces a Sol LeWitt art piece using D3 to generate a grid of alternating horizontal and vertical rectangles. The rectangles are masked by two overlapping circular symbols, one inverted, to create the final visual composition. The code leverages `select`, `range`, `symbol`, and `symbols` from D3, rendering SVG shapes across the full window dimensions. The masks are built with appended `mask` elements and paths, using D3’s `join` for efficient data binding.