Try this exercise as an example of variance ...Use your own signature. Write it standing up, sitting down, while you are walking, write it using different pens, sign it small and large. Write it when you are ticked off and when you are happy, write it after a couple of beers, Then compare them... are they all exactly the same ??
Now make it MORE interesting compare those signatures of yours to something you signed 5 years ago, 10 years ago. None of them will be exactly the same all of the time.
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jim@stinsonsports.com