The wedding was Celia Thornton’s, and it was a beautiful wedding, and everything went perfectly except for one thing, which was that during the toast — when Celia’s father stood and raised his glass and said the words about love and family and the beginning of something new — the man seated at table seven stood up, and walked out of the reception, and was not seen again, and no one at table seven could remember who had invited him or what his name was or what he had been doing at a wedding where no one knew him.

Celia heard about this the next morning, from her maid of honor, who had been too busy managing the gift table to notice it happening in real time. The man had simply stood, during the second toast — not the first, not the father-of-the-bride toast, but the best man’s toast, which had been long and had included a story about the groom’s childhood that had made everyone laugh — and he had walked to the exit and he had left, and the door had closed behind him with a sound that was, her maid of honor said, oddly final, the sound of a door closing in a room where no one was planning to enter again.

The photographs confirmed what table seven reported. In the formal photographs taken before the ceremony, the man at table seven appeared clearly — tall, dark-haired, dressed in a suit that was not quite the right shade of charcoal for the other men’s suits but close enough that no one had noticed in the moment. In the photographs taken after the ceremony, during the reception, he appeared in the background of several shots, always at the edge of the frame, always slightly out of focus, always facing toward Celia and the groom. In the photographs taken during the best man’s toast, he was standing. In the photographs taken after the toast, he was gone.

Celia could not find the man in any of the photographs clearly enough to identify him. She放大 each image on her laptop until the pixels became visible, and what she found was that the man’s face, in every photograph, was slightly different — not dramatically so, not the kind of difference that would be noticeable to someone who was not looking for it, but different enough that she could not construct, from the photographs alone, a coherent image of what he looked like. In one photograph his nose was longer. In another his jaw was wider. In a third his eyes were set closer together. She showed the photographs to her husband, on their honeymoon in Portugal, and he said she was catastrophizing and probably had food poisoning from the oysters they had eaten the night before. She did not argue. She put the photographs away. She tried not to think about the man from table seven.

She thought about him constantly. Not in a worried way — in the way one thinks about a word that has temporarily escaped from memory, the feeling of something pressing at the edge of consciousness without quite arriving. He had been there. He had stood during the toast. He had left. The door had closed. No one had followed him. No one had thought to follow him. This was the thing that Celia could not resolve: that a stranger had attended her wedding, had stood during the toast, had walked out, and that no one present had found this worth commenting on or investigating or remembering. It was as if he had been part of the event precisely because no one was supposed to notice him.

The guest list, when Celia examined it after returning from Portugal, contained no name she did not recognize. The seating chart, similarly, was full of names she knew. There was no table seven — or rather, there had been a table seven, but when she cross-referenced it against the guest list, the names did not match, and when she went back to the original seating chart document on her laptop, she found that table seven had been added to the chart three days before the wedding, in handwriting that was not her handwriting and that she did not recognize, and that the names at table seven were names that did not appear on the guest list at all.

Celia had the wedding planner investigate. The wedding planner reported that table seven had been set up as part of the standard layout, that it had been assigned to a group of guests that the wedding party had designated as extended family, and that the group had arrived together and had been polite and unobtrusive throughout the evening. The wedding planner had not thought to check their names because they had seemed, at the time, like people who belonged there. When the wedding planner tried to describe them, the descriptions were vague — tall, medium-height, well-dressed — and when she was asked specifically about the man who had stood during the toast, she could not recall his face clearly enough to describe it.

Celia stopped looking into it. She was busy with married life, with the adjustment to living with another person, with the beginning of the process of combining two lives into one, which was harder than the wedding had suggested it would be. She filed the photographs away on an external hard drive and she did not look at them again for a year, and when she did look at them again, on the anniversary of the wedding, she found that the man at table seven had disappeared from all of them. Not replaced. Not edited out. Simply gone, as if he had never been there, as if the pixels where he had been had been overwritten by the pixels of the room around him. The photographs showed an empty chair at the edge of the frame where he had stood. They did not show a person.