Chapter 1. Why Seductive Interactions?

THE SETTING IS the Odenplan Metro Station in Stockholm, but we could easily be in the subway in New York or the Tube in London. There’s an escalator running next to a set of stairs, both leading up into the daylight. Only today something is different. An experiment is taking place. The stairs seemingly have been transformed into piano keys. Not only do they resemble the familiar black-and-white keys of a piano, but through the magic of technology—sensors attached to speakers—every step triggers the resonant sound of a piano key.

We watch as two people start to take the escalator, pause, then place a foot on the first step. A low, loud note rings through the station. They each take a few more steps, caution ...

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