This example demonstrates how to draw a simple face using polylines in D3.js v5. The visualization renders a blue zigzag line across an SVG canvas, tracing a rough facial outline from scattered coordinate points. The code defines a `draw` function that uses `d3.line` to create a line drawer, which is then applied to an array of coordinate pairs. The SVG element is selected with `d3.select`, and the resulting path is appended with customizable stroke styling. The example highlights D3's declarative API for building vector graphics from raw data points.