In this article, we observe the evolutions involved by the use of new technology in the communication around urban projects. Our analysis of the new modalities, Internet was able to import in the participation of inhabitants in urban projects (chapter 1) urges us to examine, more specifically, the modifications concerning the nature and the status of the information about space. The democratization of computer-based spatial representation’s tools (3D, simulation) entails more and more systematic recourse to virtual images of the project, with high definition (chapter 2). But, nowadays, we still know little about their impacts on the perception and the reception, the inhabitants make of the project (chapter 3).