A friend I have known for almost a decade is two different people depending on how many chairs are at the table. When it is the two of us at a small place near her office, she is funny in a slow, careful way, the kind of funny that needs a listener who will wait. Put her at a dinner of eight and she goes quiet, watchful, generous with everyone else's stories and stingy with her own. For years I thought one of those was the real her and the other was a mask. I have stopped believing that. They are both her. The room just keeps changing which one comes out.

Most of what happens here is about attention. One on one, attention is undivided and steady, and some people open like a hand when they have all of it. In a group, attention is a thing to be managed, passed around, occasionally hidden from. The person who was warm and specific at coffee becomes a careful editor at a party, not because they have turned cold, but because they are doing math the whole time. Who has not spoken yet. Whether the joke will land with this particular mix. People who seem inconsistent are often just very aware of the size of the audience.

It runs the other direction too. There are people who are flat and almost dull alone, who say very little and ask less, and who come fully alive only when there are six of them and a reason to perform. You meet them at a wedding and think they are the best person in the room. You get them alone the next morning and the lights are off. Neither version is a lie. They simply draw their energy from the shape of the gathering, and a quiet table gives them nothing to work with.

The practical mistake is judging the whole person from one setting. I have written people off as distant because they shrank at a loud table, and later found out the small version of them was the one worth knowing. I have also overrated people who were dazzling in a crowd and had nothing left when the crowd went home. If you have only ever seen someone in one configuration, you have read one page and assumed you know the book.

I want to be fair to the group version though, because it is not noise to be filtered out. Watching who someone becomes with an audience tells you what they want to be seen as, and that wanting is real information. The friend who needs to be the funniest one at every table is telling you something true about what she is afraid of. The one who disappears into the role of the good listener is telling you something too. The performance is not the opposite of the truth. It is a different part of it.

If you only ever meet a person in one kind of room, you know one of their rooms. Before you decide who someone is, get them into another one. Take the group friend to a slow lunch. Bring the quiet one to something loud. The gap between the two is not a flaw to resolve. It is most of the person, and you will not have met them until you have seen both sides of it.