Page 78 in the book, where Galinda stares at Elphaba in their dorm, who in turn is staring out the window:
They both gazed at the green and flowery spectre reflected in the watery old glass, surrounded by the blackness, driven through with the wild rain beyond.
A maplefruit leaf, shaped like a star with blunted points, or like a heart grown lopsided, suddenly whirled out of the night and plastered itself on the
reflection in the glass, gleaming red and reflecting the firelight, just where the heart would be - or so it seemed from the angle at which Glinda stood.
"Entrancing," she said. "There's some strange exotic quality of beauty about you. I never thought."