The proprioceptive-change theory, however, does not imply such radical introspective error. According to proponents of the theory, experience normalizes after adaptation to reversal not because things that really look leftward “seem to look rightward” (what this might mean is enigmatic at best), but rather because the subjects eventually become familiar with the way things look when reversed—much as ordinary subjects can learn to read mirror-reversed writing fluently (Harris 1965: 435–36). Things seem “normal” after adaptation, in other words, because subjects are again able to cope with the visually perceived world in a fluent and unreflective manner.