'Penguin books, first published in 1935, were the first mass-market paper-backs in Britain. The vision of Allen, John and Richard Lane, Penguin began life as an imprint of The Bodley Head, republishing existing works of fiction and non-fiction... the appearance of the classic Penguin cover design has so ingrained itself in the nation's consciousness that today, seventy years later, everybody thinks they know what a Penguin looks like.' (Penguin By Design, Phil Bains, pg. 6).
If you would like more information about Penguin and their book designs, you can take out Penguin By Design, Puffin By Design, Penguin 75... and a few others, all to be found on the ground floor of the Library.