GAVIN PATHROSS likes his Americano at a particular strength, with exactly 2.8 shots of espresso, an order that human baristas struggle to get right. But the baristas at Ratio, his new coffee shop in Shanghai, are anything but human. Customers specify, order and pay for their coffee via their smartphones. A robot arm then grinds the beans, pumps shots of espresso and carries out the rest of the work. The robot can supply water and coffee in any ratio desired-hence the shop's name. Once it has prepared the beverage, it passes the finished product to a human waiter for serving.
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