What is Wear?

A friend just told me about his father's truck. It has over 300,000 miles on it and a couple interesting wear marks on the interior from being used so much. The edge of the driver's side seat is rubbed bare from getting into the tall vehicle. Also, the middle section of the front bucket seat shows wear from the driver's arm resting there. These examples remind me that wear isn't just a recording of the object's life, but often is direct evidence of people's use, behavior, and interaction.