Dutch designer Daan Mulder has created the ‘Form Follows Function’ sofa. A three dimensional model of the sofa is created with a computer program. The model consists of three curved faces which can be virtually unfolded. Next, these faces are manufactured from steel plates with a laser cutting process. The plates are bent and welded together to obtain the final shape of the sofa. All functionalities of the sofa are created from one continuous line.

http://www.contemporist.com/2010/12/12/form-follows-function-sofa-by-daan-mulder/