The switch here, in perspective, acts as the possible barrier between the bulldozer and the tree, if it's switched off.
My whole campaign is based upon the idea of looking behind our actions, and what effect they have on the beings around us. Everytime we plug in an electric appliance, even if it's very small, it has tremendous effects on creatures to far away, and we don't get to see those effects.
The similar concept, with a penguin and an ignition switch and key.
