The unity of effect or impression is a point of the greatest importance. It is clear, moreover, that this unity cannot be thoroughly preserved in productions whose perusal cannot be completed at one sitting.
I consider myself an essayist and a fiction writer. In the essays, I certainly have been influenced by some of the leading science essayists. Like Loren Eiseley, Stephen Jay Gould, Lewis Thomas.
Science fiction is never about the future, in the same way history is rarely about the past: they're both parable formats for examining or commenting on the present.