A MONG the boutiques in the canal dis-trict of Amsterdam is a shoe shop, called w-21, that has a selection of stylish footwear in the window. A select group of customers were recently invited there to have their feet scanned by a laser, and then to spend 30 seconds walking on a modified treadmill in a special pair of shoes stuffed with accelerometers, pressure gauges, thermometers and hygrometers. All this generated a wealth of data, which was displayed on a large screen along with a model of how the walker's feet were moving.
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