Monsters come in all shapes and sizes. sometimes they are obvious to spot, either by their sharp fangs or by the snakes in their hair. but often monsters are hidden and can look a lot like normal people: what's monstrous about them is on the inside, not the outside.

Whats the question asking? Or did you just want to post a cool poem?

Explanation:

they are monstrous because of how they react to seeing people

“way of writing” should be replaced with “writing style"

“idea” should be replaced with “purpose.”

maybe   “people from a long time ago” should be replaced with “elizabethans.”