Collaborative work is very important in engineering and architecture because of the many disciplines involved in the design process. For this reason, it is necessary to deliver to all the actors of the system not only relevant data, but also information corresponding to their specific skills. Because in architecture the visual experience is mainly based on projections, we want to show that a wider choice of them is the best way to improve the data exchanges. We choose the simple geometric problem of solar illumination. Because it is essential to take it into account from the first steps of the design to the final project, the partners have to communicate with several kinds of projections that are not always the most standard ones. In this process all the collaborators are expected to contribute to the fluency of the exchanges with the consequence that, in order to magnify some aspects of the design, they are induced to define new representations.