I love machines. We have no end of them in our shop. Some are fairly simple, hand held, while others are much more complicated, running under the control of computers. Each machine does wonderful things.
But my favourite machines don't do anything useful by normal definition. These machines don't have moving parts nor do they actually even work. While sometimes very complicated visually their only purpose is to create fun. In order for the gismos to operate viewers have to suspend their disbelief and imagine the function.
I've designed many dozens of these mechanical wonders through the years and built more than a few as well. Current projects in the shop include some of these delights and more are on my drawing board for future projects. Stay tuned...