In the workroom, the picture on the wall shows an image of an entirely different place. It is not the first time that it has been there, nor will it be the last.

On the contrary, the room has wandered from one function to another, ever since a certain period of production has been here. The transition from one sphere of production to another and the entire process of production, then, consists of the exchange of products.

It is not the result of the form which is shown, but its preliminary condition. The transition from one phase of the labour-process to another is effected by the aid of objects, by the aid of materials.