을 펼쳐

… spread, open, or unfold

→ 을
phrase Rare #32,393
… spread, open, or unfold 을 marks the object of the verb; 펼쳐 means “spread,” “open,” or “unfold,” depending on what is being spread.
KO: 책을 펼쳐 보세요.
EN: Try opening the book.

마음을 열고 상상력을 펼쳐

Open your heart and let your imagination run free.

— 죽은 시인의 사회 (1989)