They are used to seeing double at Dunedin's Tahuna Normal Intermediate School - it has 14 pairs of twins.
"Basically, we have a classroom of twins, as our average classroom size is 28," deputy principal Keith Hutton said.
"It can be tricky to recognise them if they're close [in likeness]. Unless you have a lot of dealings with them, you don't know which one you're talking to.
"I struggle with some of them, but a few of them are boy and girl combinations, which makes it easier. We usually split them. It would be unusual to have both in the same class," he said.
"A lot of them have similar interests and strengths. But I do think they're all their own little people."
The school roll of 483 pupils will get another double bump in the near future.
"I just showed two twins from Alexandra around the school," Mr Hutton said.
"So, we'll have another set of twins here next year."
Aston Pearcy, 12, responded in double time when asked what it was like to have a twin.
"I don't really know what it's like not to have a twin," he said.