Milan 2014: Dutch architecture firm UNStudio has revealed a chair with an S-shaped seat that allows its user to move from sitting upright to relaxing with a leg up (+ slideshow).

Part of UNStudio's Gemini collection for Dutch brand Artifort, the asymmetric chair was designed to let sitters "sit up, slouch, lounge, hang, repose or hunker", as well as to "shift, twist, turn, swing around, pivot to face each other or turn towards the room."

Set upon an asymmetric frame, the body of the chair curves towards the floor on one side and arches upwards to form both an arm and a backrest on the other. This shape allows a user to sit in a variety of different positions.

"The main concept for the Gemini design is versatility," Ben van Berkel, co-founder of UNStudio, told Dezeen.

"We approached this not only in terms of where the chairs can be used, but also in terms of how. The shape of the chair allows for a wide variety of seating positions and therefore also for variety in perspectives and views of the spaces in which it is placed."

The chair is available in two varieties: one curving to the left and the other to the right. The seat shell is made with a metal insert that is padded with foam, covered with Dacron and upholstered with a stretch fabric. There are four types of upholstery available, in two different blues, beige and orange.

The Gemini collection also includes a small matching side table. This features a metal frame, upholstered sides and a tabletop made of solid oak.

The chairs are on display in Pavilion 16, F30 at the Salone Internazionale del Mobile, Milan.

Here's a project description from UNStudio:

Gemini, Artifort (Schijndel, NL) 2014

Gemini for Artifort has been designed as individual furniture pieces which can be placed as single seating elements, in pairs or in groups of various sizes and configurations. The concept for the design of the chair centers on flexibility of movement, versatility in seating positions and variety in spatial experiences.

Set upon an asymmetric frame, the generously proportioned single-surface body of the chair curves towards the floor on one side and arches upwards to form both an arm and a backrest on the other. This contoured composition affords the user variety in seating positions and directionality: they can sit up, slouch, lounge, hang, repose or hunker, but they can also shift, twist, turn, swing around, pivot to face each other or turn towards the room.

Spatially Gemini introduces varying visual orientations of the spaces in which the chairs are placed and offers the possibility to choose between sitting alone, sitting together or simply enjoying different views of the surrounding space. When coupled with either its direct twin or its mirrored twin, the nonsymmetrical silhouette of both the frame and the soft element transforms to create a curvilinear symmetry.

The horizontally subdivided soft body of the chairs can be upholstered in up to three ways in one or two colours, from a choice of many different shades. Gemini can be used in private, public and semi-public settings, such as waiting areas, lobbies, offices, lounge areas and libraries.