Library shelves are rigid mulitiered structures. Within them books are ordered for ease of utility. Knowledge Power Library Shelves are not as rigid because the opposing shelves ascend and descend in relation to eachother. Each side of these bookshelves contains volumes for the specific side of a debate. The sides are equalized despite the difference in mass by movement of the fulcrum which can only be set by a mathematical calculation. When library patrons walk by and notice that texts on Applied Management Techniques are higher than Critical Theory they can do their best to even things out.-- rcarty, Dec 18 2012random, halfbakery