On October 23, over 200 people gathered at the Murphy Auditorium in Chicago to attend the Driehaus Foundation’s 2019 Built Environment Symposium entitled Classical & Modern: The Power of Architectural Vocabulary on Behavior. By comparing the Parthenon in Athens, Greece, and the S.R. Crown Hall in Chicago, Illinois, the symposium expanded on the ideas and themes of these structures through the lens of architectural vocabulary and cognitive science, providing insight into how architectural design influences behavior.