"Hea reasoned that there was a deep-seated gene in some people who were able to notice pattersn in things, and to make sense of them. Many centuries ago, when we lived in mud-huts, ate berries, and 'high-tech' was a pointy stick, those people who watched things moving and made notes were one of the most important people in the tribe."
See my comments above about pattern completion etc. I always knew we spotters were really latter day tribal leaders, so let's have a bit of respect from the rest of you lowly tribesmen, and remember to salute anyone in an anorak from now on.