"La invariante temporal" from Marcelo Grosman gathers a selection of work done between the late eighties to the present. The book also reunites the artists reflections on the uses of photography in the contemporary space of images. His production goes from classic photography to the manipulation of archives of images, and he presents them in various media: Installations, video, and many ways of reproduction and optical capture, contemporary and obsolete. The image in movement and the subject in movement is the synthesis of a conceptual exercise throughout his work: there is not chronological order, but the order of the various intellectual explorations, around the domestication of the body, the social taxonomies, the secret languages, the iconography of gestures and the uses of technique amongst his multiple searches.