Depicts a line (囱) piercing a heart (心) (i.e. having an insightful understanding), conveying the meaning "insightful", now written as 聰. The current meaning is a phonetic loan.
Shuowen Jiezi
《說文》：“悤，多遽悤悤也。从心、囪，囪亦聲。”
Original meaning
insightful
Components
心(iconic) — In ancient China, it was thought that the heart was the center of thought and reasoning.
囱(sound, iconic) — Depicts a line piercing. Represents having an insightful understanding in one's thoughts.