Depicts grain (來) being rolled between the fingers in the left hand (左). Based on the original meaning "rub between fingers", now written as 搓. The meaning later shifted to "uneven" and "error".
差 and 左 don't sound similar in modern Mandarin due to historical phonetic changes. They were more similar
in older Chinese.
Character Evolution
BronzeSpring and Autumn771-476 BCBronzeLate Spring and Autumn~500 BCBronzeLate Spring and Autumn~500 BCBronzeLate Spring and Autumn~500 BCBronzeLate Warring States~250 BCBronzeLate Warring States~250 BCSealWarring States (Chu)475-221 BCSealWarring States (Chu)475-221 BCSealWarring States (Chu)475-221 BCSealWarring States (Chu)475-221 BCSealWestern Han202 BC-9 ADSealShuowen~100 ADSealShuowen~100 ADClericalWestern Han202 BC-9 ADClericalWestern Han202 BC-9 ADClericalEastern Han25-220 ADRegularModern