Popular Penguins are presented in a more "authentic" interpretation of the Penguin Grid than that of the Celebrations series. They are correct size, when compared to an original 'grid-era' Penguin, and they use Eric Gill's typefaces in a more or less exact match for Jan Tschichold's "tidying" of Edward Young's original three panel cover design. The covers are also printed on a card stock that mirrors the look and feel of 1940s and 50s Penguin covers. On the other hand, all of the Popular Penguins series are in Penguin Orange, and not colour-coded in the manner of the original designs and the "Celebrations" titles.