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Scorpion451
Since: Jan, 2013
bitemytail
Since: Dec, 2011
A common staple of video games (of all levels of realism): the hero is exloring a dungeon, a castle, an ancient Temple of Doom, or some such, and comes across many mechanisms (typically lever-operated) that work reversibly — without any obvious source of power. For example, flip a small lever and a heavy wall panel will slide up revealing a passage; flip the lever again and the panel will slide down; flip the lever again and the panel goes up again, and so on indefinitely. (Obviously an Acceptable Break from Reality, but makes you wonder what's powering all this...)