When it comes to distributing scientific knowledge, photography and the museum share a number of characteristics. One like the other operate by selection, fragmenting the real. They proceed by composition, regrouping, in printed albums or in the confined space of a shop window, room or building, the fragments they produce. Both are mediators of something that contains, metaphorically or literally, and which is made present to the spectator even if he is distant, in time or space, or even if it is an entity that is only thought of and takes care of physical realization is established in the process of mediation.