Instruct: Classify the given Amazon review as either positive or negative.
Query: Two typographic icons

The late Ruary McLean has deligted the world of typography with many seminal books on the subject. "Jan Tschichold: a life in typography" is but one good example of his prodigious output. McLean uses his personal acquaintance with Tschichold to good effect in a delightful essay about this important 20th century type designer. The essay evaluates the work of this controversial figure who started as a convential designer, espoused a radical change, and then reverted to a more classical view of typography. The book contains many examples of Tschichold's work from all three stages of his development. An excellent reference.