“Look...at...me..." he whispered. The green eyes found the black, but after a second, something in the depths of the dark pair seemed to vanish, leaving them fixed, blank, and empty. The hand holding Harry thudded to the floor, and Snape moved no more.”
“Diamonds are found only in the dark bowels of the earth; truths are found only in the depths of thought. It seemed to him that after descending into those depths after long groping in the blackest of this darkness, he had at last found one of these diamonds, one of these truths, and that he held it in his hand; and it blinded him to look at it. (pg. 231)”
“Blue is the most common eye color in Oria Province, but there is something different about his eyes and I'm not sure what it is. More depth? I wonder what he sees when he looks at me. If he seems to have depth to me, do I seem shallow and transparent to him?”
“She was a very pretty woman. She had dark red hair and her eyes -- her eyes are just like mine, Harry thought, edging a little closer to the glass. Bright green -- exactly the same shape, but then he noticed that she was crying; smiling, but crying at the same time. The tall, thin, black-haired man standing next to her put his arm around her. He wore glasses, and his hair was very untidy. It stuck up at the back, just like Harry's did.Harry was so close to the mirror now that his nose was nearly touching that of his reflection."Mum?" he whispered. "Dad?"They just looked at him, smiling. And slowly, Harry looked into the faces of the other people in the mirror and saw other pairs of green eyes like his, other noses like his, even a little old man who looked as though he had Harry's knobbly knees -- Harry was looking at his family, for the first time in his life.The Potters smiled and waved at Harry and he stared hungrily back at them, his hands pressed flat against the glass as though he was hoping to fall right through it and reach them. He had a powerful kind of ache inside of him, half joy, half terrible sadness.”
“Hang on . . .” Harry muttered to Ron. “There’s an empty chair at the staff table. . . . Where’s Snape?”"Maybe he's ill!" said Ron hopefully. “Maybe he’s left,” said Harry, “because he missed out on the Defense Against the Dark Arts job again!”“Or he might have been sacked!” said Ron enthusiastically. “I mean, everyone hates him —”“Or maybe,” said a very cold voice right behind them, “he’s waiting to hear why you two didn’t arrive on the school train.”Harry spun around. There, his black robes rippling in a cold breeze, stood Severus Snape.”
“I am alone. They have gone into the house for breakfast, and I am left standing by the wall among the flowers. It is very early, before lessons. Flower after flower is specked on the depths of green. The petals are harlequins. Stalks rise from the black hollows beneath. The flowers swim like fish made of light upon the dark, green waters. I hold a stalk in my hand. I am the stalk. My roots go down to the depths of the world, through earth dry with brick, and damp earth, through veins of lead and silver. I am all fibre. All tremors shake me, and the weight of the earth is pressed to my ribs. Up here my eyes are green leaves, unseeing.”