This example visualizes the recursive flattening of nested arrays into a single linear sequence. It shows a branching tree of values collapsing inward as the algorithm traverses each level, with individual elements animating into a final horizontal row. The code uses a custom `flatten` function that recursively iterates through nested arrays and pushes non-array values into a result array. Rendering relies on D3’s force simulation to position the collapsing nodes and transition paths, while the data itself is generated from arbitrary nested array structures defined in the source gist.