Used an ipod for the first time this week while being mobile about the City. You can see the results. Much fewer observations. That surprised me. When one is tuned into the music, there is far less, to almost no interaction with the world around. I experienced this for the first time. Gave insight into what all those ear-plugged persons are experiencing, on the street, on the subway and bus and walking. It not only takes one out of the moment, it also takes one away from interaction. For me a dilemma, for others perhaps something completely different.