How do you stop theft or other crowd related activity (i.e. pickpocketing, especially wallets and mobile phones)? One of the answers is spacing. Make sure you give people room to look at items freely, without having to stand close to someone. Shop theft largely occurs due to opportunity - i.e. lack of surveillance (either a shop keeper or CCTV, usually both), an item that's easy to pickpocket, and a split-second decision to take the item. Clues Booktown did this really well.