He had felt that a moment before his making the turn,....

“ He had felt that a moment before his making the turn, someone had been there. The air seemed charged with a special calm as if someone had waited there, quietly, and only a moment before he came, simply turned to a shadow and let him through. Perhaps his nose detected a faint perfume, perhaps the skin on the backs of his hands, on his face, felt the temperature rise at this one spot where a person's standing might raise the immediate atmosphere ten degrees for an instant. There was no understanding it. Each time he made the turn, he saw only the white, unused, buckling sidewalk, with perhaps, on one night, something vanishing swiftly across a lawn before he could focus his eyes or speak.But now, tonight, he slowed almost to a stop. His inner mind, reaching out to turn the corner for him, had heard the faintest whisper. Breathing? Or was the atmosphere compressed merely by someone standing very quietly there, waiting?He turned the corner. ”

Ray Bradbury

From : Fahrenheit 451