They might not have been built by machines.  Here&#x27;s a video of those transformers being made:  <a href="https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=HEJn74Z3wHk" rel="nofollow">https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=HEJn74Z3wHk</a>