The QR opens your building's book on the shelves at communityservices.cc/shops/ - a paper-and-ink page turned with a finger. The shelves already carry a sample building, The Magnolia, so the hanger does something the moment it's printed.

For a building's own pages (its group links, its shares, its words), the custom-style JSON below slides into shops/data/shops.js - same shape as the sample, one book per building. No account, no server; the shelf is just a list of books.