At the beginning the "system control" concept was an idea for a palimpsest. But the print wasn't well, because the original paper, a circuit diagram for a hi-fi equipment, is in the DIN A3 size and so I printed first the left side and then the right side of the paper as DIN A4, but this was a bad idea.
Finally I decided to make a simple sandwich with the circuit diagram-paper and the pictures:
First version of the first picture:
second version of the first picture:
After this I made a photoshop montage with the pictures in two 40x50cm frames: