“Separating them were two layers of brick, a few inches of plaster, and nine years of silence.”

“People took what they wanted, they clutched at coincidences, the few there were, and made a life from them. . . . Choices are made in brief seconds and paid for in the time that remains.”

“For Alice and Mattia, the high school years were an open wound that had seemed so deep that it could never heal. They had passed through them without breathing, he rejecting the world and she feeling rejected by it, and eventually they had noticed that it didn't make all that much difference. They had formed a defective and asymmetrical friendship, made up of long absences and much silence, a clean and empty space where both could come back to breathe when the walls of their school became too close for them to ignore the feeling of suffocation.”

“With photography Alice liked the actions more than the results. She liked opening the back of the camera and unrolling the new film a couple of inches, just enough to catch it in the runner, and thinking that this empty film would soon become something and not knowing what, taking the first few snaps into the void, aiming, focusing, checking her balance, deciding whether to include or exclude pieces of reality as she saw fit, enlarging, distorting.”

“Mattia was right: the days had slipped over her skin like a solvent, one after the other, each removing a very thin layer of pigment from her tattoo, and from both of their memories. The outlines, like the circumstances, were still there, black and well delineated, but the colors had merged together until they faded into a dull, uniform tonality, a neutral absence of meaning.”

“Mathematicians call them twin primes: pairs of prime numbers that are close to each other, almost neighbors, but between them there is always an even number that prevents them from truly touching. Numbers like 11 and 13, like 17 and 19, 41 and 43. If you have the patience to go on counting, you discover that these pairs gradually become rarer. You encounter increasingly isolated primes, lost in that silent, measured space made only of ciphers, and you develop a distressing presentiment that the pairs encountered up until that point were accidental, that solitude is the true destiny. Then, just when you’re about to surrender, when you no longer have the desire to go on counting, you come across another pair of twins, clutching each other tightly. There is a common conviction among mathematicians that however far you go, there will always be another two, even if no one can say where exactly, until they are discovered.Mattia thought that he and Alice were like that, twin primes, alone and lost, close but not close enough to really touch each other. He had never told her that. When he imagined confessing these things to her, the thin layer of sweat on his hands evaporated completely and for a good ten minutes he was no longer capable of touching anything.”

“she and Mattia were united by an invisible, elastic thread, buried under a pile of meaningless things, a thread that could exist only between two people like themselves: two people who had acknowledged their own solitude within the other.”