Suddenly, one of the core justifications for Near Field Communication, the technology powering tap-to-pay, starts to feel redundant. But what if all those button presses and taps could be replaced by simply waving your card or phone in the air? By analyzing subtle variations in the magnetic fields generated when NFC cards interact with antennas, they identified nine distinct movement gestures that can serve as additional inputs. To test this, they held an NFC card near an antenna reader and used a connected computer to observe the raw data waves that appeared. Another experiment simulated a vending machine, where participants used the same swiping gestures to select a snack or soda.