Image: Vial
This variation on the shell chair is by Patrick Frey.  Called the Kirk Chair, it is manufactured by Vial and made from aluminium suitable for indoor as well as outdoor use.  The aluminium of the chair consists of a special alloy which is bent into the shape of the seat and the edges are then folded under to increase stability. The chair is constructed in such a way that the actual design process remains visible.  The cutouts give it a unique spatial quality.

Images: Vial