Here is a smart way to overcome the problem of small spaces in libraries. These moving shelves are in the School of Journalism library at University of Missouri. Such shelves are used especially in the basements.
“In 1908, Walter Williams established the School of Journalism at the University of Missouri, Columbia, the first such school in the world.” [source]
p.s. The shelves stop automatically if someone moves between the shelves or were obstructed by an object.
Jaraad 
smart and neat + simple!
hehehe…the surprise is that we use the same technique in Gaza !!
Haitham, yes, very creative. Utilizing small spaces at its best.
Abu el sharif, welcome…welcome!
By “the same technique” do you mean you have these moving bookshelves in libraries or were you referring to something else?
So glad you like Spacesaver’s Compact Mobile Shelving units!! Our primary goal is to save space by eliminating unnecessary aisles between static shelving units! This is especially useful for libraries like this one! Check out more cool installations of mobile shelving at http://www.spacesaver.com!