Crops of various book jacket art, found on the web.
I like all the emotion in these: the nervous expression of the man contemplating his skull-double outside the black hole; the shadowy giant coming between the guy with the futuristic Sta-Prest collar and his agonized woman; the mighty thrust of the cosmic bowler toward three grim, middle aged, hovering clone faces.
People say science fiction is an art for adolescent boys but that's only a way of minimizing the extreme psychic discontinuities it reveals.