Haettenschweiler's highly compact, tightly spaced and industrial design is a prominent example of the aggressive, menacing style of graphic design that despite its poor legibility was popular in the 1960s and 70s, and was often used for purposes besides newspapers, such as book covers [REF].
This type of design has been criticised for having low legibility in smaller point sizes, in situations with low contrast between background and text colours, or at a distance, with (for example) 8 and 9 seeming very similar.