an office worker places an original document face-down on the glass surface of a large photocopying machine. She presses the green start button and bright light flashes underneath the glass lid. The machine whirs and mechanical sounds indicate it's working as paper feeds through the output tray. Identical copies of the original document emerge one by one into the collection bin. A coworker waits nearby holding a stack of papers, watching the copying process with interest. a photocopying machine producing exact copies of original documents