designer's own words:Modular shelf is assembled with two groups of elements: horizontally placed boards, and vertical elements that are inserted between them. With its shape, vertical elements secure steadiness of whole shelf. This product is assumed to be purchasable in elements, so that number of elements, composition and size depends on the need of user. Vertical elements are constructed in the way that every part is bended for 90 degrees in opposite direction that secures steadiness of whole shelf. Sandwich construction of vertical elements is made of two sheets of metal (1mm thick); between them is a sheet of rubber foam (10mm thick). Each of material is constructively weak, while in combination they form strong construction.