A. V. Dicey’s great achievement in Law of the Constitution was to give to the amorphous common law constitutional tradition an analytical structure that allows rational inquiry into the character and value of that tradition. This structure is based upon principles rather than rules, so the result is not a detailed map but an impression of the constitutional landscape that draws the eye to important contours and features allowing critical appreciation of the scene. A distinctive part of this achievement is the identification of a legal reference or vantage point from which the landscape can be surveyed. Dicey saw the constitution with a legal turn of mind.