Fork of Marks and Channels demonstrates five distinct visual encodings for a dataset of indices 0 through 4: x-position, y-position, size, length, and shape, plus a final panel showing hue with `schemeCategory10`. Each panel renders as a separate SVG using `d3.select` and data joins via `.join()`. The code imports specific D3 APIs such as `symbol()` and `symbolsFill` for shape encoding, alongside basic `attr` assignments for positioning and scaling.