Essential wall system composed of aluminium shelves and tubes and wood cabinets. It has been designed to hold a high number of books and small items with a particulary low footprint of 15 cm. Once it is full of books, a Krossing structure tends to camouflage and makes room to the items. This is an ideal structure for novel books; in the kitchen, to store glasses, cups, jars ans spices; in the bathroom to store perfumes and creams, or in the kids bedroom, to display toys. This system allows to create either squared shape strutures or more fun and creative compositions.