we did an experiment today with light sensitive paper. You place the paper under objects that make differing shaddows and place it in the sunlight. You then use a developer to develop the image and you get some really good effects with the length of exposure. It is all unpredictable and you have to take some time in getting it all to work the way you want it. You can either make a work from the image that you have or do a lot of images and that becomes your work.