Each customer introduces data (length, height, preferred colors) and the parametric system responds by automatically changing some of the attributes (depth, thickness, colour saturation). In this way each customer is assured of a unique configuration. Parametric Furniture, particularly Parametric Bookshelves, helps develop and produce an infinite number of unique pieces, tailored to the customer's requirements, using a single model. Each element composing Parametric Bookshelves is defined by tree attributes affecting Parametric Bookshelves configuration. Each Parametric Bookshelves is provided of a code as a customer warranty of the uniqueness and originality of the piece.