A grid of horizontal and vertical striped rectangles is revealed through two overlapping masks, creating a dynamic composition where the stripes intersect and fade. The visualization uses D3 v7's `select`, `range`, and `join` to generate 100 rows and columns of semi-transparent rectangles. Two SVG masks, each containing a large circle symbol from `d3.symbol`, invert their fill to selectively hide and show portions of the stripe layers, producing a lens-like effect. The rendering is entirely SVG-based, with masks applied via `.attr('mask', ...)`.