My Brilliant Friend by Elena Ferrante

"On December 31st of 1958 Lila had her first episode of dissolving margins. The term isn't mine, she always used it. She said that on those occasions the outlines of people and things suddenly dissolved, disappeared. That night, on the terrace where we were celebrating the arrival of 1959, when she was abruptly struck by that sensation, she was frightened and kept it to herself, still unable to name it. It was only years later, one night in November 1980 - we were thirty-six, were married, had children - that she recounted in detail what had happened to her then, what still sometimes happened to her, and she used that term for the first time."