Photograms or Rayographs are camera-less images created by placing objects on a photo sensitive surface and exposing them to light. if the light touch the paper it will turn black but if there a object on the paper it will go a grey or a white. When you take the object of the shape of you object will be there because the light has not touch your paper so it will be negative. Here are some examples.
This was my first one I was really pleased with it because my objects was overlapping each other and there was transparent objects. the only thing I would change is the pattern at the bottom because you can not really see it because it is transparent.
This is my second one. I like this one because I thought the feather would not work and it did and because I have a shadow on the tape. the only thing I would change is the ring this is because I don't like the shape of them.