A list of banned books is over 118,000 titles long and it's constantly growing, according to a professor from the University of British Collumbia.
Professor Florian Gassner is the co-leader of a project to compile a digital list of censored books that is publicly available and searchable.
The project is called Die Kasseler Liste and it was inspired by an art installation in Germany that recreated the Parthenon using banned books.
Gassner says the first hurdle he and his team of students team had to overcome was deciding what constitutes censorship. They decided to include titles banned by governments as well as books that were taken off the shelves of public institutions
-- like schools and libraries -- after public pressure.
Gassner says government censorship is still a reality in countries like China, Russia, and Nigeria. He doesn't mention the current trend for banning books in the west on grounds of political correctness.
Gassner also wants people to understand that censorship goes beyond book-banning; it limits what can be written in the first place.