In June 2009, people going about their ordinary routines in Stockholm encountered a series of perplexing and—most important—fun diversions. One day, commuters at the Odenplan subway station found that the staircase had been replaced with a musical piano keyboard, replete with sound. Young and old alike abandoned their usual ride on the adjacent escalator to scamper up and down the steps. Couples played duets. Children picked out tunes with their parents. Dedicated soloists hopped up and down,...


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