Carboard.

When I was little, I made a slot machine out of a cardboard box. It was a pretty smooth operation. I had little cardboard boxes on a cardboard dowel that I would spin with my hands once a patron would pull the cardboard lever. If they won I would dispense spare change.
It's nothing compared to this but, it makes me awfully reminiscent of it.

Cardboard Mechanics Installation from Sasj on Vimeo.