I recently restored a 1938 Singer sewing machine as a friend's birthday gift. The gears are all metal, which explains why I was easily able to get the 73-year-old machine running like it was brand-new. Singer's plastic-geared machines from the 1960s, on the other hand, would not be so easy to restore. The plastic gears can simply rot.
Along these lines, check out artist Ryan Kothe's "Worn Out," below. The stop-motion animated short looks at how the objects around us can—and will, given enough time—fall victim to the ravages of long-term wear. (I'm still a fan of metal over plastic, though. Lasts longer.)