A talk I gave at the MEX, the user experience event in London, 2011.
I spoke about local interactions and coined a new buzzword: "pX". I warned that the same interaction can be recreated with different technologies, so don't put all your eggs in one NFC-enabled basket.
2 years later, Apple's adoption of low energy Bluetooth (BLE) and rejection of NFC is likely to have a big effect on proximity experiences.
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