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Joseph Rosenfeld was looking at the exhibit as the Museum of Science—an exhibit more than twice his own age—when he saw it.

The math was wrong.

When the Virginia high schooler recently came to Boston on a family trip, he visited the museum with his aunts. Joseph noticed the error in an equation for the Golden Ratio, part of the “Mathematica: A World of Numbers...and Beyond” exhibit. There were minus signs where there should be plus signs.

The Mathematica exhibit was created by design team Charles and Ray Eames, and has been at the museum since 1981. The pair made their name in the architecture and furniture design worlds, and created the exhibit to “provide an opportunity for everyone to enjoy the wonder of mathematics as well as the beauty of post-modern design,” according to the Museum of Science website.

Joseph noticed the mistake and left a message at the front desk, but didn’t leave any contact information, according to Joseph’s father, Scott Rosenfeld. Joseph’s aunts contacted the museum, which then sent a letter to the family.

“You are right that the formula for the Golden Ratio is incorrect. We will be changing the – sign to a + sign on the three places it appears if we can manage to do it without damaging the original,” Alana Parkes, the museum’s exhibit content developer, wrote in the letter. Joseph said he double-checked himself before leaving the comment.

“An unusual thing about Mathematica is that the whole exhibition is considered an artifact,” Parkes wrote. “This means that decisions about everything in the exhibition requires both Curatorial and Content Development consent (and most things can’t be changed at all). It also means that this mistake has been there for a very long time.”

But the museum said that since getting Joseph’s card, they were able to fix the mistake.

The Rosenfelds visit Boston often—Scott grew up in the area and his three sisters still live here, but they’ll have another reason to come back even sooner: The museum invited him come see The Science Behind Pixar exhibit. It features a lot of math content; Math and science are Joseph’s favorite subjects. The family plans to visit again in two weeks.