This visualization demonstrates how multiple symbol shapes can be rendered and layered using SVG masks, creating an intricate pattern of intersecting geometric forms. The code generates 100 horizontal and vertical rectangles that are clipped by two distinct masks, each revealing different symbols from the d3.symbols array. Using d3's `select`, `range`, and `symbol` functions, the visualization positions each shape and applies SVG mask attributes to control visibility, resulting in a dynamic interplay between the rectangular grid and the underlying symbol paths.