Easter egg with Oda's name and One Piece on the spines of books. One of the books reads "Fune no hou" which can mean "ship's cannon" and another simply reads "Hon" meaning "book".
From Episode 70.
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A virtual Easter egg is a hidden message or feature in an object such as a movie, book, CD, DVD...
Eiichiro Oda, born January 1, 1975 in Kumamoto City, Kumamoto Prefecture in Japan, is a Japanese...