Did you know that about in One Piece, the author Eiichiro Oda, frequently hides the number 4 in the background of his drawings as a form of wordplay. In Japanese, the number 4 is pronounced "shi," which also means death. Due to this superstition, some buildings in Japan skip the fourth floor or use alternative ways to represent the number. Oda cleverly incorporates the number 4 into various scenes in One Piece, adding a subtle and amusing element for eagle-eyed readers to discover.