Use of the "uncanny valley" in visualizations of Smith/Lovecraft horror.
For those unfamiliar with the concept of the "uncanny valley" I've included a short video on the subject.
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The second half of the video refers to games specifically, but it's a good primer.
I was going through some images inspired by eldritch horror concepts and it struck me that most visual representations tend to rely on the "uncanny valley" as a means of evoking horror.
There are literally millions of examples of this on the web which you can easily google, but for video the best example I can give would be the movie "Dagon" which is based on the "Horror over Innsmouth" by Lovecraft (the title was taken from another unrelated Lovecraft story).
HIGHLIGHT BELOW THIS AREA TO REVEAL SPOILERS.
In the opening of the film an woman is seen in a dream as a mermaid. She is beautiful and erotic, however the dream becomes a nightmare when her mouth is revealed to be filled with razor sharp, fish-like teeth. Later the main character meets her in real life when he runs into her bedroom while she is sleeping in an attempt to escape from a group of cultists and monsters. She hides him, telling the person at the door that she is alone. He is enraptured with this woman from his dreams and she entices him to kiss her. As they kiss he moves the covers she was lying under and discovers that instead of legs she has tentacles. Once again a physical revelation turns beauty into horror.
END OF SPOILERS.
I'd be interested to see what others think about this aspect of eldritch / psychological horror.