Starting with the figure of Peter Eisenman, this article presents the concept of the diagram and its importance in the architectural production of recent decades in order to then demonstrate how such a project tool allows us to think, visualize, and speculate not only about architectural form but also about the contextual forces that surround any spatial construction. This hypothesis will be supported by the critical analysis of two literary works: Diagram Diaries by Eisenman and Urban Flotsam: Stirring the city by Raoul Bunschoten/CHORA, accompanied by several illustrative examples where the graphic expression of these forces and their influence on the form and program of the architectural, urban, or territorial project is made visible.