Abstract

Diagrams, schemata, itineraries, we are accustomed to forms of arrowheads in representation. These forms often evoke movements that writing necessarily freezes on the paper while they propose to themselves to express their dynamics. Recent progress in techniques of communication and of expression permit us at limes to surmount these difficulties. When they can spread out into space (and lime) of a propable to entrer in its turn into movement (a machine – or simply a hand), this “liberated” forms permit us to remove (or at the every least to rattle) important epistemological obstacles which subsist in practice as in theory.