The people who work here know us. Even when other people in the restaurant look too long at us for our movements and the way we talk — or don’t — the people here don’t ever give us that go-away look I’ve had other places. Linda just points to what she wants or sometimes she writes it out first, and they never bother her with more questions.

Tonight our favorite table is dirty. I can hardly stand to look at the five dirty plates and pizza pans; it makes my stomach turn to think of the smears of sauce and cheese and crust crumbs, and the uneven number makes it worse. There is an empty table to our right, but we do not like that one. It’s next to the passage to the rest rooms, and too many people go by behind us.

We wait, trying to be patient, as Hi-I’m-Sylvia — she has that on her name tag, as if she were a product for sale and not a person — signals to one of the others to clean up our table. I like her and can remember to call her Sylvia without the Hi-I’m as long as I’m not looking at her name tag. Hi-I’m-Sylvia always smiles at us and tries to be helpful; Hi-I’m-Jean is the reason we don’t come in on Thursdays, when she works this shift. Hi-I’m-Jean doesn’t like us and mutters under her breath if she sees us. Sometimes one of us will come to pick up an order for the others; the last time I did, Hi-I’m-Jean said, “At least he didn’t bring all the other freaks in here,” to one of the cooks as I turned away from the register. She knew I heard. She meant me to hear. She is the only one who gives us trouble.

But tonight it’s Hi-I’m-Sylvia and Tyree, who is picking up the plates and dirty knives and forks as if it didn’t bother him. Tyree doesn’t wear a name tag; he just cleans tables. We know he’s Tyree because we heard the others call him that. The first time I used his name to him, he looked startled and a little scared, but now he knows us, though he doesn’t use our names.

“Be done in a minute here,” Tyree says, and gives us a sidelong look. “You doin’ okay?”

“Fine,” Cameron says. He’s bouncing a little from heel to toe. He always does that a little, but I can tell he’s bouncing a bit faster than usual.

I am watching the beer sign blinking in the window. It comes on in three segments, red, green, then blue in the middle, and then goes off all at once. Blink, red. Blink, green, blink blue, then blink red/green/blue, all off, all on, all off, and start over. A very simple pattern, and the colors aren’t that pretty (the red is too orange for my taste and so is the green, but the blue is a lovely blue), but still it’s a pattern to watch.

“Your table’s ready,” Hi-I’m-Sylvia says, and I try not to twitch as I shift my attention from the beer sign to her.

We arrange ourselves around the table in the usual way and sit down. We are having the same thing we have every time we come here, so it doesn’t take long to order. We wait for the food to come, not talking because we are each, in our own way, settling into this situation. Because of the visit to Dr. Fornum, I’m more aware than usual of the details of this process: that Linda is bouncing her fingers on the bowl of her spoon in a complex pattern that would delight a mathematician as much as it does her. I’m watching the beer sign out of the corner of my eye, as is Dale. Cameron is bouncing the tiny plastic dice he keeps in his pocket, discreetly enough that people who don’t know him wouldn’t notice, but I can see the rhythmic flutter of his sleeve. Bailey also watches the beer sign. Eric has taken out his multicolor pen and is drawing tiny geometric patterns on the paper place mat. First red, then purple, then blue, then green, then yellow, then orange, then red again. He likes it when the food arrives just when he finishes a color sequence.

This time the drinks come while he’s at yellow; the food comes on the next orange. His face relaxes.

We are not supposed to talk about the project off-campus. But Cameron is still bouncing in his seat, full of his need to tell us about a problem he solved, when we’ve almost finished eating. I glance around. No one is at a table near us. “Ezzer,” I say. Ezzer means “go ahead” in our private language. We aren’t supposed to have a private language and nobody thinks we can do something like that, but we can. Many people have a private language without even knowing it. They may call it jargon or slang, but it’s really a private language, a way of telling who is in the group and who is not.

Cameron pulls a paper out of his pocket and spreads it out. We aren’t supposed to take papers out of the office, in case someone else gets hold of them, but we all do it. It’s hard to talk, sometimes, and much easier to write things down or draw them.

I recognize the curly guardians Cameron always puts in the corner of his drawings. He likes anime. I recognize as well the patterns he has linked through a partial recursion that has the lean elegance of most of his solutions. We all look at it and nod. “Pretty,” Linda says. Her hands jerk sideways a little; she would be flapping wildly if we were back at the campus, but here she tries not to do it.

“Yes,” Cameron says, and folds the paper back up.

I know that this exchange would not satisfy Dr. Fornum. She would want Cameron to explain the drawing, even though it is clear to all of us. She would want us to ask questions, make comments, talk about it. There is nothing to talk about: it is clear to all of us what the problem was and that Cameron’s solution is good in all senses. Anything else is just busy talk. Among ourselves we don’t have to do that.

“I was wondering about the speed of dark,” I say, looking down. They will look at me, if only briefly, when I speak, and I don’t want to feel all those gazes.

“It doesn’t have a speed,” Eric says. “It’s just the space where light isn’t.”

“What would it feel like if someone ate pizza on a world with more than one gravity?” Linda asks.

“I don’t know,” Dale says, sounding worried.

“The speed of not knowing,” Linda says.

I puzzle at that a moment and figure it out. “Not knowing expands faster than knowing,” I say. Linda grins and ducks her head. “So the speed of dark could be greater than the speed of light. If there always has to be dark around the light, then it has to go out ahead of it.”

“I want to go home now,” Eric says. Dr. Fornum would want me to ask if he is upset. I know he is not upset; if he goes home now he will see his favorite TV program. We say good-bye because we are in public and we all know you are supposed to say good-bye in public. I go back to the campus. I want to watch my whirligigs and spin spirals for a while before going home to bed.

Cameron and I are in the gym, talking in bursts as we bounce on the trampolines. We have both done a lot of good work in the last few days, and we are relaxing.

Joe Lee comes in and I look at Cameron. Joe Lee is only twenty-four. He would be one of us if he hadn’t had the treatments that were developed too late for us. He thinks he’s one of us because he knows he would have been and he has some of our characteristics. He is very good at abstractions and recursions, for instance. He likes some of the same games; he likes our gym. But he is much better — he is normal, in fact — in his ability to read minds and expressions. Normal minds and expressions. He misses with us, who are his closest relatives in that way.

“Hi, Lou,” he says to me. “Hi, Cam.” I see Cameron stiffen. He doesn’t like to have his name shortened. He has told me it feels like having his legs cut off. He has told Joe Lee, too, but Joe Lee forgets because he spends so much of his time with the normals. “Howzitgoin?” he asks, slurring the words and forgetting to face us so we can see his lips. I catch it, because my auditory processing is better than Cameron’s and I know that Joe Lee often slurs his words.