The tiny steam engine! It's truly remarkable what watchmakers can accomplish with their skills and precision. The fact that this tiny engine requires multiple microscopes, including scanning electron microscopy (SEM), is a testament to its minuscule size.

As the article states, building something this small requires an incredible amount of attention to detail and patience. Every component has to be precisely crafted to ensure proper function and alignment. It's like trying to build a tiny machine that can power a miniature industrial revolution!

I love how the author highlights the watchmaker's skill set required for this project. Watchmaking is already an extremely precise craft, but taking it down to such a small scale requires an added level of expertise. It's amazing to think about the countless hours and days spent designing, prototyping, and fine-tuning each component before assembling the entire engine.

Have you ever seen anything like this before? What do you think is the most impressive aspect of building something so tiny?