The Artisan, the Sage and the Irony: An Outline of Knowledge Sociogenesis -- Technicization of the Neurosciences: Uses of Image-Processing Software in Brain Research -- Cryptography, a Human Science? Models, Matrices, Tools and Frames of Reference -- The Beauty of Equation: The Anthropologist and the Engineer in Design Processes -- Conclusion: Confrontations with Confusions: Stakes to be Re-established.