This is the fourth in a series of video podcasts for the PBS series e2 design II. Each podcast takes you beyond the episodes and deeper into the world of sustainable design. Biophilia is a hypothesis that describes humans as emotionally connected to all other living systems. Jonathan Rose, a New York City-based real estate developer, describes how biophilia can guide building design in dense urban environments. In many instances, biophilia shares the same principles as sustainable building design.