This seems to be a mechanical calculator. I&#x27;ve always found mechanical calculators fascinating and delightfully intuitive, because of how physical they are --- you can actually <i>see</i> components move around and perform calculation. Although in this case, I would&#x27;ve liked to see more details on how the sum is generated.<p>Related: Super Mario Maker is Turing-Complete: <a href="https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=HcLE1MuyodA" rel="nofollow">https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=HcLE1MuyodA</a>