The general presentation of these performances is studied according to the place of representation and the architectural possibilities which it offers. In general, the frontal scene/public report/ratio is eliminated with the profit from an INSTALLATION on the surface available.

On a basic level which could be that of an anatomical board of the Encyclopaedia of Diderot, these machines are installed in order to reconstitute an overall body.

It captures the sounds of the machines by a choice of three different processes: cell, direct or micro catch. The selected sounds are retransmitted on line by radio wave towards a sampler. The musicians isolate the sound matter which interests them then allot it in the digital keyboards. It then becomes possible to play on keyboard a sound of machine heard in room a few seconds before and to accompany it. The musicians complete a work of "pure" improvisation since the matter even of the sounds which they will treat their remainder unknown factor until the last moment.

In repetitions, the musicians are prepared on principles of setting in situation. Each machine is initially analyzed in order to seize exactly the various stages which characterize it:

 According to these principles, the required objective will be a sound prolongation of the machine which they accompany in correspondence.