Which came first? Although this technique must stretch back into antiquity. It's kind of a trope in movies and books with scientists / inventors. Watson sometimes was Sherlock's rubber duck / cutout dog.
In fiction (and film particularly) these sorts of characters are often a narrative device so that things can be explained without needing an omniscient narrator.
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See Related: https://en.wikipedia.org/wiki/Rubber_duck_debugging
Which came first? Although this technique must stretch back into antiquity. It's kind of a trope in movies and books with scientists / inventors. Watson sometimes was Sherlock's rubber duck / cutout dog.
In fiction (and film particularly) these sorts of characters are often a narrative device so that things can be explained without needing an omniscient narrator.