This example generates two sets of horizontal and vertical bars that overlap to form a grid-like pattern, with a circular mask revealing the intersection of the layers. Horizontal bars are shown only inside the circle, while vertical bars appear only outside it, creating a contrast between the two regions. The visualization is rendered in SVG using D3 v6, with `range`, `select`, and `append` to construct the bars and masks, and relies on D3’s `mask` elements to define the visible areas. No external data is used; the composition is purely procedural.