Good product design can be seen in the transitions of an object, that is, the way the designer handles the areas where different surfaces or materials meet. This is particularly true when you've got hard surfaces meeting soft surfaces; look closely at office chairs, car seats or sneakers to see how these can be handled well or poorly.
As an example of this, check out footwear designer and runner Richard Kuchinsky's video where he discusses Nike's Alphafly in detail, from the perspective of both a designer and an end user. Even if you're already well familiar with the ins and outs of footwear design, you're bound to learn a thing or two by seeing what Nike got right--and wrong--in the Alphafly's latest iteration:
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