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“I was back in New York, and I was walking down the street and a guy looked up at me, pulled earphones out of his head and said, ‘Hey … you’re on my iPod!’

In Stuart's earphones has been a podcast detailing the brutality of the Eastern Front in World War Two.

Here was a middle-aged woman, fresh off a run, casually clutching a pair of earphones in her hand while she placed an important work call.

Small portable radios were common, but they didn’t sound good and usually came with just a small earphone that went in one ear.

Each participant wore earphones to hear both their taps and their partner's taps, and they had to anticipate their partner's movements.