H. P. Lovecraft gave the world more monsters than just about any other writer. Only H. G. Wells can claim a more important position. (HPL built on Wells’ example, so they actually compliment each other.) What HPL realized about monsters was they should be outside our experience. Wells gave us the giant rat or “the natural creature made monstrous”. As he also did with the Morlocks, once having been men. Or a man who is invisible and insane. Or animals made to look and act like men on Moreau’s island. It is only with the Martians from The War of the Worlds that Wells ventured into that territory Lovecraft would expand: the alien, the unknown monster.
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