When creating furniture, designers must employ a careful blend of functionality and aesthetics. This week, we showcase five unique pieces whose structures are the focus of the overall design. FRIDAY LOUNGE Formstelle, 2012 The subtly formed wooden frame of the Friday Lounge has a leather back with a design reminiscent of a pattern cut. Soft down cushions lie gently in the frame while a sophisticated technical construction of spring action and seat cushion offer superb comfort designed to last a lifetime.  PLANK DINING Craig Bassam & Scott Fellows, 2004 The Plank Table Series aims to minimize the essentials of a table to its simplest components. The sculptural simplicity of the table's form and the placement of the supports away from the corners allow the table to function as a one-person desk or a multi-person table for home or office. SECONDA Mario Botta, 1982 With a perforated sheet metal seat and a frame in your choice of metallic grey, black, red, or yellow powdercoated steel, this unique seat will make a bold statement in any environment. TWIGGY Ilkka Suppanen & Raffaella Mangiarotti, 2014 The structure of the Twiggy is a beautiful play of oak sticks, which can be seen under the glass top. This multifunctional table is available in three sizes and two finishes. YAK Lucidi & Pevere, 2015 The Yak is held together by a wooden dowel that blocks the cowhide in a mechanical way and becomes the outstanding earmark of this collection. Yak is enhanced by the choice of fabrics with material weaves, like wool, linen, cotton and Mongolian fur, adding little accents that underscore the primitive character.