It's unused semantic space. One arm communicates such and such about a character, the other arm just mirrors it, so by occupying that space with a different block of information, you get free characterization (plus the flourish of broken symmetry). cf. T-800 torn face
It's possible to overdo broken symmetry very easily and have character designs dissolve into noise, though, eg "Cronenberg Rick and Cronenberg Morty".
-
This Tweet is unavailable
Loading seems to be taking a while.
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.
. Banned in Sweden. SubGenius, Zhuangist, white-hat troll. Defrocked mathematician. Brain problems.