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The article links to a very funny video of today's kids trying to figure out a Walkman:

It's surprising to see how challenging the Walkman UI is to a complete novice.

Not many UIs are intuitive.

I once tried to use a clickwheel iPod whilst my collleague was in a shop. I had to give up and revert to the car stereo for music.

The majority of UX enlightenment comes from demonstration.