Creative Bookshelf

Systems of arrangement
There are three stationary systems of arranging bookcases: Flat against the wall; in stacks or ranges parallel to each other with merely enough space between to allow of the passage of a librarian; or in bays or alcoves where cases jut out into the room at right angles to the wall-cases. The stack system is suitable only for public libraries where economy of space is essential; the bay system is not only handsome but utilizes the space to great advantage. The library of the City of London at the Guildhall is a peculiarly effective example of the bay arrangement.
For libraries where space is extremely tight there is yet another system, usually called mobile aisle shelving. In such systems rows of bookcases are mounted on wheels and packed tightly together with only one or more aisles between them. It is possible then to visit only two bookcase sides at a time, all the others being pressed close together. A gearing mechanism allows users move the bookcases and open the aisle in the desired location. Because of the danger of tripping on the floor mounted rails or being squashed between bookcases these systems may have electronic sensors and/or recessed track, or are reserved for closed stacks where access is restricted.