This example shows a recursive approach to deep cloning plain JavaScript objects, where each nested object is duplicated rather than shared by reference. The code defines a `cloneDeep` function that iterates over an object’s own enumerable properties using `Object.entries`, checks whether each value is an object with `typeof value === 'object'`, and if so, calls itself recursively; otherwise, it assigns the primitive value directly. The visualization likely demonstrates this process step by step, perhaps animating the traversal of a sample object tree. However, the code explicitly notes it does not support arrays, converting them into object-like structures with numeric keys, as seen in the comment about `['foo', 'bar']` becoming `{0: 'foo', 1: 'bar'}`. No external libraries are used—only native JavaScript methods and operators.