If he had simply upped and left the apartment that very evening and not come back, no one would have found any sign of his presence, apart from those incomprehensible pages stacked on the table. Mattia had put nothing of himself into the place. He had kept the anonymous pale oak furniture and the yellowed wallpaper that had been stuck to the walls since the building was constructed.

He got to his feet. He poured boiling water into a cup and immersed a tea bag in it. He watched the water turn dark. The methane flame was still lit and in the gloom it was violently blue. He lowered the flame until it was almost out and the hiss faded. He held his hand over the burner. The heat exerted a faint pressure on his devastated palm. Mattia brought it down slowly, and closed it around the flame.

He had spent hundreds and thousands of identical days at the university, and consumed innumerable cafeteria lunches in the little low building on the edge of the campus, but even now he remembered the very first day when he had walked in and copied the sequence of gestures of the other people. He had joined the line and, taking small steps, had reached the pile of plastic imitation-wood trays. He had picked one up, set the paper napkin on it, and helped himself to cutlery and a glass. Then, once he was in front of the uniformed woman who served up the portions, he had pointed to one of the three aluminum tubs, at random, without knowing what was in them. The cook had asked him something, in her own language or perhaps in English, and he hadn't understood. He had pointed to the tub again and she had repeated the question, exactly the same as before. Mattia shook his head. I don't understand, he had said in English in a loud and nervy voice. She had raised her eyes to the sky and waved the empty plate in the air. She's asking you if you want sauce on that muck, said the young man next to him in Italian. Mattia had spun around, disoriented, and shook his head. The young man had turned toward the dinner lady and simply said no. She had smiled at him and finally filled Mattia's dish and handed it to him. The young man had chosen the same and had brought it up to his nose and sniffed it with disgust. This stuff is revolting, he had observed.

You've just got here, then? he had asked him after a while, still staring at the thick puree on the plate. Mattia had said yes and the young man had nodded with a frown, as if it were a serious matter. After paying, Mattia had frozen in front of the cash register, his hands gripping the tray. He had looked around for an empty table, somewhere he could avoid feeling people's eyes on him and eat alone. He had just taken a step toward the back of the room when the young man from before had overtaken him and said come on, over here.

Alberto Torcia had already been there for four years, with a permanent research post funded by the European Union for the quality of his most recent publications. He too had escaped from something, but Mattia had never asked him what. Neither of them, after so many years, could have said whether the other was a friend or just a colleague, in spite of the fact that they shared an office and had lunch together every day.

It was Tuesday. Alberto sat down opposite Mattia and, through the glass of water that he brought to his lips, glimpsed the new mark, pale and perfectly circular, on his palm. Alberto didn't ask any questions, but merely gave him a crooked glance to let him know that he understood. Gilardi and Montanari, sitting at the same table, were sniggering over something they had found on the Internet.

Mattia drained his glass in one gulp, then cleared his throat.

"Yesterday evening an idea came to me about the discontinuity that-"

"Please, Mattia," Alberto interrupted him, dropping his fork and flopping back in his seat. His gestures were always very exaggerated. "At least have pity on me when I'm eating."

Mattia looked at the table. The slice of meat on his plate was cut into identical little squares and he separated them with his fork, leaving between them a regular grill of white lines.

"Why don't you do something else with your evenings?" Alberto went on more quietly, as if he didn't want the other two to hear him. As he spoke he drew little circles in the air with his knife.

Mattia said nothing and didn't look at him. He brought a little square of meat to his mouth, chosen from the ones on the edge whose fringed borders disturbed the geometry of the composition.

"If only you'd come and have a drink with us every now and again," Alberto continued.

"No," Mattia said brusquely.

"But-" Alberto protested.

"Anyway, you know."

Alberto shook his head and frowned, defeated. After all this time he still insisted, even though in all the years they had known each other he had managed to drag him out of the house only a dozen or so times.

He turned to the other two, breaking into their conversation.

"Have you seen her over there?" he asked, pointing to a young woman sitting two tables away with an elderly gentleman. As far as Mattia knew, the man was a geology professor. "If only I wasn't married, Christ, what I could do to a woman like that."

The others hesitated for a moment, because it had nothing to do with what they were talking about, but then they shifted gears and joined in, speculating about what such a babe was doing with an old windbag like that.

Mattia cut all the little squares of meat along the diagonal. Then he reassembled the triangles so as to form a larger one. The meat was already cold and tough. He took a piece of it and swallowed it almost whole. The rest he left where they were.

Outside the dining hall Alberto lit a cigarette, to give Gilardi and Montanari time to move away. He waited for Mattia, who was following a rectilinear crack along the ground and thinking about something that had nothing to do with being there.

"What were you saying about discontinuity?" he said.

"It doesn't matter."

"Come on, don't be a dick."

Mattia looked at his colleague. The tip of the cigarette between his lips was the only color that brightened that entirely gray day, the same as the one before and doubtless the same as the one that would follow.

"We can't escape it," said Mattia. "We've convinced ourselves that it exists. But I may have found a way to get something interesting out of it."

Alberto came closer. He didn't interrupt Mattia until he had finished his explanation, because he knew that Mattia didn't talk much, but when he did it was worth shutting up and listening.

32

The weight of consequences had collapsed on her all at once one evening a few years before, when Fabio, as he pushed inside her, had whispered I want to have a baby. His face was so close to Alice's that she had felt his breath sliding along her cheeks and dispersing among the sheets.

She had pulled him to her, guiding his head into the hollow between her neck and shoulder. Once, before they were married, he had told her it was the perfect fit, that his head was made to slip into that space.

So what do you think? Fabio had asked her, his voice muffled by the pillow. Alice hadn't replied, but had held him a bit tighter. She hadn't had the breath to speak.

She'd heard him closing the drawer with the condoms in it and had bent her right knee a little more to make room for him. Rhythmically she stroked his hair, her eyes wide open.

That secret had crept after her since her school days, but it had never taken hold of her mind for more than a few seconds. Alice had set it aside, like something she would think about later on. Now, all of a sudden, there it was, like an abyss cut into the black ceiling of the room, monstrous and irrepressible. Alice wanted to say to Fabio stop for a moment, wait, there's something I haven't told you, but he moved with disarming trust and he certainly wouldn't have understood.