Raven

“This tower, patched unevenly with black ivy, arose like a mutilated finger from among the fists of knuckled masonry and pointed blasphemously at heaven. At night the owls made of it an echoing throat; by day it stood voiceless and cast its long shadow.”
― Mervyn Peake, Titus Groan

“Through me you pass into the city of woe:
Through me you pass into eternal pain:
Through me among the people lost for aye.
Justice the founder of my fabric moved:
To rear me was the task of power divine,
Supremest wisdom, and primeval love.
Before me things create were none, save things
Eternal, and eternal I shall endure.
All hope abandon, ye who enter here.”
― Dante Alighieri, The Divine Comedy: The Inferno, the Purgatorio and the Paradiso

“They told of dripping stone walls in uninhabited castles and of ivy-clad monastery ruins by moonlight, of locked inner rooms and secret dungeons, dank charnel houses and overgrown graveyards, of footsteps creaking upon staircases and fingers tapping at casements, of howlings and shriekings, groanings and scuttlings and the clanking of chains, of hooded monks and headless horseman, swirling mists and sudden winds, insubstantial specters and sheeted creatures, vampires and bloodhounds, bats and rats and spiders, of men found at dawn and women turned white-haired and raving lunatic, and of vanished corpses and curses upon heirs.”
― Susan Hill

“Living systems are never in equilibrium. They are inherently unstable. They may seem stable, but they’re not. Everything is moving and changing. In a sense, everything is on the edge of collapse.”
― Michael Crichton, Jurassic Park