Banned books are so sensitive! They can't even cross the Chinese border! So the students made their own, and disguised them as salted fish.
Original idea developed from a comment in Tianya forum on how to smuggle banned books, as I remember it:
"I once packed banned books in between my mother's salted fish she bought from Hong Kong and no one found out.." -unknown netizen
-2017
Photographer: Lanny Li