Constructing systems to counter asymmetric threats

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I went for a walk today, before sunset, and walked for over 2 1/2 hours, and the last half an hour was after sunset.

I didn't meet anyone during the walk, but at one point I heard a man and a woman talking on the other side of the hill. The man was telling about the route they were taking, saying that the length is between 4,500...5,000 steps, and I started wondering whether he was really counting all the steps he was taking. And only later I realized that he must be using some kind of pedometer.

Here are photographs taken in the dark, on December 11th.

(Posting title is from the poem Total Information Awareness by John Beer.)