Creative Bookshelf

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.
Barrister's bookcase
A barrister requires the use of many law books and may frequently move to new chambers. A specialised form of portable bookcase has thus developed to meet their needs. A barrister's bookcase consists of several separate shelf units that may be stacked together to form a cabinet. An additional plinth and hood complete the piece. When moving chambers, each shelf is carried separately without needing to remove its contents and becomes a carrying-case full of books.