A generative geometric composition reproduces Sol LeWitt's vertical wall drawing across a CSS grid of nine cells, with triangular polygon clusters forming striped patterns that repeat symmetrically. The central cell layers a dark square rotated 45 degrees over a lighter diamond shape, using SVG masks to clip the pattern. Implemented in JavaScript with D3, the visualization calculates polygon points procedurally and uses `selectAll` with `.join('polygon')` to render shapes, while `d3.symbol` and `symbols` draw the rotated square forms.