There is a traditionnal opposition between the time/space categories of physics and the lived space and time of phenomenology. The paper, using Piaget's understanding of formalism as an anti-model, explores how this dichotomy has been devised, why it cannot be sustained as soon as the study of scientific and technical practice re-embeds time and space production inside metrological networks, and, finally, offers an alternative account of time and space production that is based on another theory of "the exploration" of Being.