Packaging
The front cover image comes from an edition of the Cambridge Encyclopedia of Astronomy, and was originally drawn with black lines on a white background. It presents successive pulses from the first pulsar discovered, PSR B1919+21—often referred to in the context of this album by its older name, CP 1919. The image was suggested by Bernard Sumner. The cover design is credited to Joy Division, Peter Saville and Chris Mathan.
The back cover of the album contains no track listings, leaving a blank table where one would expect the listings to be. The original release came in a textured sleeve. The original LP release contained no track information on the labels, nor the traditional "side one" and "side two" designations. The ostensible "side one" was labeled Outside and displayed a reproduction of the image on the album cover, while the other side was labeled Inside and displayed the same image with the colours reversed (black-on-white). Track information and album credits appeared on the inner sleeve only.
Read more about this topic: Unknown Pleasures, Background