A vintage folding camera - a Voigtlander Perkeo from the 1950s. An example from a type commonly described as a `folder/folding' camera. With a simple push of the buttons on the inside of the door the lens recedes into the body of the camera making for a compact, pocket-sized pack. These are bare-basic photo takers. None of the auto or program settings that you find on modern cameras - you take one of these out, you do everything - set the aperture, shutter speed -- no metering, gauge/guess the lighting -- wind frame, focus, cock the shutter, compose and... yes, click to take pic. You really need to concentrate.
... And they are great conversation starters. Take one of these out of your pocket at any place... surely a bunch of people will want to know about these beauties or occasionally someone will recall with nostalgia the fun they themselves have had using these gems.
This one takes a 6cm/6cm pic on a 120 mm film.
Nothing like one of these fully manual cameras to help you unwind.