Photogram
A photogram is a photograph that is made without a camera. Something is placed on top of some photographic paper (or a similar material) and then shining light on it. At the end of this, you get a shadow picture. It usually has different tones. This depends on how transparent the object is.
Photogram Media
One of Anna Atkins's cyanotype photograms of Festuca grasses
Gelatin silver print photogram by Jaromír Funke (1926; modernism)
Modern color x-ray photogram of a wine scene