Unfold Your City app analytics for October 27

A shelf of pop-up books, one for each of the world's great cities. Open a book and the city rises out of the page: towers stand up, bridges reach across the river, palace roofs lift into the sky, folded the way real paper pop-ups fold. Lie it flat and the day turns to dusk, the windows light up one by one, a music box plays, and the city comes alive: Big Ben chimes, Tower Bridge lifts for a tall ship, lanterns glow in Seoul, the sun sets behind Barcelona. MADE FOR IPHONE DUO On iPhone Duo, the phone is the book. Closed, its outer screen shows the cover. Unfold the phone and the book opens with it: slowly, and every card stands up exactly as paper would; snap it open, and the whole city springs up. On any other iPhone, a hinge at the bottom of the screen opens the book. FOUR CITIES TO START • Barcelona: the Sagrada Família, Casa Batlló and Park Güell. Free. • London: Westminster and Big Ben, Tower Bridge, Buckingham Palace. • New York: the Manhattan skyline, the Statue of Liberty, Central Park. • Seoul: Gwanghwamun, N Seoul Tower, the old roofs of Bukchon. Every book is printed in the style of an old atlas: cream paper, gold-foil covers, map pages with compass roses, and a little paper plane that travels with you from city to city. TURN THE PAGES Drag a page to turn it, or tap its edge. Rock the book and the city answers: boats rock, lanterns sway, the plane swings wider. ONE CITY AT A TIME, OR EVERY CITY Barcelona is free. Each other city is a one-time purchase. Or get Every City: every book on the shelf, and every city we add, forever. No ads. No account. No tracking.