This interactive piece displays two intersecting grids of rectangles within a circular mask, evoking Sol LeWitt's geometric wall drawings. The visualization pairs overlapping horizontal and vertical bands, with one grid serving as a negative mask to create a dynamic visual interplay between filled and empty space. Built with React and D3.js, the code uses the `select` API to construct SVG elements, the `range()` helper to generate iterations, and a layered masking technique to clip the rectangular pattern into a central circular composition. The result is a clean, generative study in form and negative space.