Machines that do nothing but switch themselves off
Useless machines are home-built devices that turn themselves off as soon as you turn them on
— and that's it. That's all the they do. The more elaborate and gimmicky the method by which they accomplish this job, the better. As a hobby, useless machines have been around since the 1950s, but Abigail Pesta of the Wall Street Journal says they're making a comeback.