How Apple's Lightning-Plug Guru Reinvented Square's Card ReaderWhen we talk about the design of a piece of hardware, we usually default to observations about its outward appearance–its form, its color, the materials it's made of. Often, though, that's only half the equation. For a product like the new Square Reader–a sleek update to the familiar credit card-swiping dongle that's nearly twice as thin as its predecessor–most of the design work is out of sight.
