Thanks to Bob Greenyer of MFMP, who brought this excellent article to my attention.
Metrology is notable for being an art no less than a science – and so is deception. All differences of intent and purpose notwithstanding, these two can be eerily alike. What makes the art of measurement different, however, from the many arts and sciences practiced by the petenshi of the world, is its propensity to deceive its own practitioner. In this particular quality it is only surpassed by few other endeavours like faith itself.