Camera-less-photography is taking pictures, without cameras. They can be made by using variety of techniques some of the most common ways would be, Photograms, Luminograms and a Chemigram. Sometimes these are combined and they involve an element of chance.
4.Floris Neususs (untitled1967) 5. Susan Derges;RiverTaw 1999 6.Adam Fuss; My ghost 1999
These images above taken by famous photographers were made camera-less, so without a camera. I find it very interesting how they can make very complex images without a camera as a first thought would be that it was taken with a camera.