Look Back in Penguin
Inspired by last year's tome on 70 years of cover designs at Penguin, this Flickr gallery attempts to collect examples of the last few decades' worth of Penguin/Pelican jackets. If anything, the starkly crude, mod, and/or trippy designs are testaments to doing a lot with relatively limited graphic resources. Of course, you've also got plenty of purely objectionable cases of crap abstraction for abstract subjects, such as the coma-inducing Psychiatry To-day.
