Holga cameras are the ultimate in low-tech photography.  They are completely made of plastic, including the lens.  Because they are so cheap and crudely made, nothing fits precisely and they frequently leak light, causing streaks on the medium format film. They have only one aperture and one shutter speed which forces the photographer to be creative in capturing light accurately.  Even the viewfinder displays only an approximation of what the lens actually frames.  But these contraints can be an asset in creating a beautifully imprecise, soft and distorted view of the world.  Sometimes I adapt the medium format film chamber to accomodate smaller 35mm film, and the sprocket holes become a compositional element.