The wooden ellipse jigs used by furniture makers are some of the niftier contraptions you'll see in a traditional shop. "I made this for an upcoming project which [involves] ovals," writes Harry T. Morris, a young craftsman who hails from Wales. "I know this can be done many other easier ways, but I enjoy the overengineering and how satisfying this is."
And lest you mistake Morris for one of those guys who spends more time building contraptions rather than actual finished products, let me assure you that the man has some skills. Take a look at this video of Morris making a Japanese sashimono box, largely by hand:
You can see more of Morris' work here.