Lawyers place great stress on the ‘objectivity’ of the law’s approach to agreements. Humpty-Dumpty may claim that ‘when I use a word it means just what I want it to mean, no more and no less’, but a lawyer would advise Humpty that the law, should it interest itself in any promise he made, would be interested not in what he meant by what he said, but in how a reasonable man would understand that which was said. This, the lawyer would explain, is the dichotomy between the subjective and the objective interpretation of words, and it is a dichotomy which has considerable influence on lawyers’ and judges’ thought. Treitel discusses it on the first page of his text, and the very title of one of the chapters of Cheshire, Fifoot and Furmston, ‘The Phenomena of Agreement’, is derived from the law’s concern ‘not with the presence of an inward and mental assent but with its outward and visible signs.