A specific (e.g., a sudden thaw, a discovery of a survivor)
He thought of the city he had left behind years ago—the constant motion, the frantic heat of millions of lives brushing against one another. He wondered if they were still moving, or if they had become a gallery of statues, caught in the middle of a gesture, a laugh, or a scream. Freezing
A different (e.g., a futuristic city, an underwater base) A specific (e