Subtlety was not a big part of the allegory in these covers.  Here we have a Cro-Magnon with a distinctly vacant expression and  a "future" man.  You can tell he's from the future because he's bald and listening to his Walkman.  Separating them and acting as the bridge between is "modern" man holding an atom.  His bold heroic posture tells us: "Now that I've got it, what the heck do I do with the blasted thing?"

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