This example manipulates SVG masks to create a dynamic visual composition of overlapping horizontal and vertical stripes. The main view is a grid of 100 rectangles that cycle through a circular mask, revealing a sunburst-like pattern from the center. A second set of rectangles uses an inverted mask to create a contrasting cross-hatch effect. The code uses the D3.js library (v7) to construct the SVG elements and apply the masking logic via the `append` and `attr` methods.