Interesting question. For something to make us afraid, it doesn’t have to be very gory-looking, though that certainly helps! However, what makes something especially scary is when it speaks to our innermost fears. For example, the dark, certain noises, and even heights can be very spooky, though none of these things are grotesque or evil-looking.
That’s why I think the horror in Frankenstein comes not just from its daemon or monster, but from the man who creates the monster—Victor Frankenstein—and his inability to love his creation.
At one level, Victor’s ambition itself is alarming. He wants to break the laws of nature and create a humanoid creature, often referred to as a "daemon" in the text. To do this, he spends years studying decayed corpses in “charnel houses” or mortuaries. Then he constructs a being using dismembered body parts. However, when the daemon he has made comes to life, Victor is absolutely repulsed by its appearance, which brings us to the biggest reason
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