Explore the innovative approach to visualizing human flow in urban environments through a conference talk on the potential landscape of human movement in cities. Delve into the challenges of handling massive datasets depicting people's daily movements for various purposes like commuting, shopping, and education. Learn how combinatorial Hodge theory is applied to extract the potential of human flow directly from origin-destination matrices. Discover how this method creates an intuitive visualization of urban structure, likening human movement to water flowing from higher to lower elevations. Gain insights into identifying attractive locations and sources of human flow, which can inform critical decisions in commercial development, transportation optimization, urban planning, and even pandemic-related movement restrictions. Understand the significance of this approach in unfolding the actual shapes of cities based on real human behavior and place-to-place interactions.