I love the idea of a truly symbiotic relationship between a thoughtfully and carefully designed mechanism and a human. I walk around and live my life, and by doing so, I give it the kinetic energy it needs to keep its mainspring wound, and in return it tells me what time it is. Always. Without fail. I just have to tweak the time if it starts to get too far off, but that’s barely even an imposition. After a good long while, it’s prudent to have them serviced, but if you’re not observing any problems, it’s generally perfectly fine, and will keep ticking along as long as you wear it regularly.