Medusa
“There is nothing in the nature of things to prevent a man from seeing a dragon or a griffin, a gorgon, or a unicorn. Nobody as a matter of fact has seen a woman whose hair consisted of snakes, nor a horse from whose forehead a horn projected (…) At any rate, none of these zoological fancies violates the fundamental laws of the intellect; the monsters of heraldry and mythology do not exist, but there is no reason in the nature of things nor in the laws of the mind why they should not exist” — Arthur Machen, Things Near and Far