- doppelganger (n.)
- 1830, from German Doppelgänger, literally "double-goer," originally with a ghostly sense. See double + gang (n.). Sometimes half-Englished as doubleganger.
- kinetic (adj.)
- "relating to muscular motion," 1841, from Greek kinetikos "moving, putting in motion," from kinetos "moved," verbal adjective of kinein "to move" (see cite).
Buster Keaton's subject was kinetic man, a being he approached with the almost metaphysical awe we reserve for a Doppelgänger. This being was, eerily, himself, played by himself, then later in a projection room, watched by himself: an experience never possible to any generation of actors in the previous history of the world. [Hugh Kenner, "The Counterfeiters," 1968]
From 1855 as "causing motion." Related: Kinetical; kinetically.