The pinhole camera is the simplest kind of camera. It does not have a lens. It just makes use of an extremely small opening (a pinhole sized opening) to focus all light rays within the smallest possible area to obtain an image, as clearly as possible.
I find this type of photography both exciting and challenging. The challenging part makes you think more about the composition because you really have not idea of what the camera is actually seeing.
For my ongoing Pinhole Photography project, I use a Zero 2000 camera which has a pinhole of 0.18mm in size and produces a 6x6cm negative.
I use a variety of black and white films and each roll is hand developed in Kodak Xtol developer and then scanned on an Epson V800 scanner. Any prints I make of the photographs are mainly printed 8x8 inches.