Brake Job Photograms

I've been working with my photography classes on producing pictures without using a camera, and photograms are a great way to teach and understand composition. In order to help them all extend their understanding of what can become a photogram, I brought in a "baggie" full of parts from the recent brake job I did on my Ford Ranger. Rear drum brakes have a bunch of springs and such, so there were plenty of shapes to choose from as I began to work. I used a transparency of the brake design diagram as a unifying background and I chose to divide the exposure in two parts. A couple of the resulting images are what I am posting. Double exposed "Brake Job Photograms".