Comparison is a tool that underscores similarities and differences between cases. The comparative method was used by art and architecture historians including Fletcher, Wölfflin, Giedion, and Rowe. By analyzing three of architect Emilio Duhart’s (1917-2006) projects, this article shows how the comparative method is used as a tool for architectural projects to make floor plans, section drawings, and elevations. These documents also show Duhart’s desire to relate his projects to old buildings: simply stated, they reflect the architect’s sense of history.