Chinese characters have increased in visual complexity over three millennia
Linguistic systems, be they spoken, written, or signed, are hypothesised to be shaped by pressures towards communicative efficiency that drive processes of simplification. A longstanding illustration of this idea is the claim that the characters of the Chinese writing system have progressively simplified over time. Here we test this claim by analyzing a dataset with more than a million images of Chinese characters spanning more than 3,000 years of recorded history. We find no consistent evidence of simplification through time, and contrary to popular belief we find that modern Chinese characters are higher in visual complexity than their earliest known counterparts. A plausible explanation for our findings is that simplicity trades off with distinctiveness, and that characters have become less simple because they have increased in distinctiveness over time. Our findings are therefore compatible with functional accounts of language but highlight the diverse and sometimes counterintuitive ways in which linguistic systems are shaped by pressures for communicative efficiency.