The Kwart modular shelving system is an ingenious puzzle piece and can be assembled entirely according to your wishes. The bookshelf derives its name from the fact that four cross elements each form a closed whole; one element is always a quarter of the whole. A Kwart bookshelf is a collection of individual elements, consisting of corner, cross and T elements. An upholstered insert can be placed in the open elements. The elements can be linked without glue, screws or tools.