What really went on there? We only have this excerpt:
The so-called New Wave of science fiction, exemplified by such writers as Samuel Delaney, Norman Spinrad, Joanna Russ, and M. John Harrison was the cause of literally tons of amazing paperback covers in the late '60s and early '70s. Here is one of them, announcing a title by the High Priest of New Wave SF, Philip K. Dick, writing in collaboration with Ray Nelson. The artist is uncredited, but I suspect it may be the noted German illustrator Mati Klarwein, best know for his cover art for Mile's Davis' Bitches' Brew. I may of course, be totally wrong.
All of the represented elements in the design are indeed present in the text of the novel: A black man is one of the principal protagonists, and a hapa woman is another. And yes, there are giant aardvarks and a mountain with an angry, glaring eye. About the only element that isn't found in the story are the zappy Art-Deco electrodes. Despite the fact that that this is an amazingly psychedelic cover design, it may be one of the most literal interpretations of the text to ever grace a book cover. God love the 1960s.