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I actually like werid or individual books cover. The covers of all the big publishing companys are the same and often their books are edited to be similar. 
Of course a nice art work is something to be appreciated but sometimes there are treasures in non-traditional published book
That adage isn't about books, necessarily - the message is that you shouldn't dismiss something/someone outright, based on your first impression.
Similarly, "even a blind squirrel can find a nut" isn't about tree rodents. The message is that misguided/ignorant people can still unwittingly come to a correct conclusion.