"What we call parks look like parking lots with some grass on them, perhaps a baseball diamond. That's not the kind of park that draws people in," Tayana Panova, a researcher who studies the built environment's effects on mental health, told me. "We need parks that have amenities and assets that make it desirable for people to go there." A third space of dreams isn't a barren field. It also includes pools, benches, art, fountains, playgrounds, and food stands — things people gather at.