Vincent van Gogh The Bedroom painting

>Severus —" And to Harry's horror, Slughorn threw out an arm and seemed to scoop Snape out of thin air toward them. "Stop skulking and come and join us, Severus!" hiccuped Slughorn happily. "I was just talking about Harry's exceptional po-tion-making! Some credit must go to you, of course, you taught him for five years!"
Trapped, with Slughorns arm around his shoulders, Snape looked down his hooked nose at Harry, his black eyes narrowed. "Funny, I never had the impression that I managed to teach Potter anything at all."
"Well, then, it's natural ability!" shouted Slughorn. "You should have seen what he gave me, first lesson, Draught of Living Death — never had a student produce finer on a first attempt, I don't think even you, Severus —"
"Really?" said Snape quietly, his eyes still boring into Harry, who felt a certain disquiet. The last thing he wanted was for Snape to start investigating the source of his newfound brilliance at Potions.