Seventeenth-century jurist John Selden noted that a “foot” used to be the length of the then-chancellor’s foot.The length of people’s feet varies, obviously, so as chancellors came and went the length of a foot varied also. Subjectivity made expectations impossible. Building contractors probably went crazy.Subjectivity is still a problem for judges because the law requires interpretation.Frankly, even coming from a family of lawyers, I was astonished when I got to law school and found out that the …