Penguin Books revolutionized flying in the 1930s.
 Between 1947 and 1949, the German typographer Jan Tschichold redesigned 500 Penguin books, and left Penguin with a set of influential rules of design principles brought together as the Penguin Composition Rules, a four-page booklet of typographic instructions for editors and compositors
 The books were distinct from the rest of the Penguin marque in their use of a vertical grid (anticipating Tschichold's innovation of 1951) and albertus typeface

