Social maps that reveal a city’s intersections — and separations

Every city has its neighborhoods, cliques and clubs, the hidden lines that join and divide people in the same town. What can we learn about cities by looking at what people share online? Starting with his own home town of Baltimore, Dave Troy has been visualizing what the tweets of city dwellers reveal about who lives there, who they talk to — and who they don’t.

My architectural philosophy? Bring the community into the process

When asked to build housing for 100 families in Chile ten years ago, Alejandro Aravena looked to an unusual inspiration: the wisdom of favelas and slums. Rather than building a large building with small units, he built flexible half-homes that each family could expand on. It was a complex problem, but with a simple solution — one that he arrived at by working with the families themselves. With a chalkboard and beautiful images of his designs, Aravena walks us through three projects where clever rethinking led to beautiful design with great benefit.

Hidden music rituals around the world

Vincent Moon travels the world with a backpack and a camera, filming astonishing music and ritual the world rarely sees — from a powerful Sufi ritual in Chechnya to an ayahuasca journey in Peru. He hopes his films can help people see their own cultures in a new way, to make young people say: “Whoa, my grandfather is as cool as Beyoncé.” Followed by a mesmerizing performance by jazz icon Naná Vasconcelos.