The 2/3 reversible bookcase measures 76 cm x 50,6 cm x 27,5 cm (D) with four sections. It can be used both horizontally and vertically. This bookcase is also available in depth 36 cm.

The elements are manufactured in particularly thin dimension of solid wood, with traditional dovetail and rabbet joints bringing incredible strength and stability to every single module. The system either rests on an adjustable base directly on the floor or is easily mounted on the wall.

Mogens Koch entire bookcase system is manufactured in the following solid wood types: Oak, mahogany and walnut.

Because there was always a very close correlation between Mogens Koch's own life and the furniture he designed, none of his designs can be regarded as purely artistic manifestations.

Rather, every piece of furniture resulted from a particular commission or was created for a particular purpose. This is also true of what became his popular Bookcase System, a solution originally intended for his own home in Hulgårdsvej near Bellahøj in Copenhagen. The house's small rooms called for flexible storage, so in 1928, Koch drew the first sketches for a square bookcase that, thanks to its relatively compact size, could be used in a multitude of different ways. In 1930, Rud. Rasmussen produced the first prototype, and in 1932 production started up in earnest.

Mogens Koch's Bookcase System has since been in continuous production for more than 80 years.