I mislaid my car in a parking lot recently. Since it happened on a Sunday afternoon at Arden Fair Mall, it’s probably less of an urban nightmare than a suburban day-mare. But it was still one of those teaching moments we enjoy only when other people are learning the lessons.

As I hiked down every aisle in the parking lot, twice, I was taken by how many cars today look very much alike. No, I don’t drive an SUV or 4×4 (which always strikes me as a math problem, the answer to which is 16); they…