This example creates a geometric composition of thin vertical and horizontal stripes that cross to form a mask-like circular pattern. Two SVG masks—one revealing a filled circle and another showing a circle cut out of a full rectangle—control the visibility of the stripes, which are generated as rectangles using D3's `range` and `join`. The visualization uses `d3.select`, `.append`, and `.attr` within a React framework, rendering entirely as SVG with D3 v6.