First I had to learn the vocabulary posted on the wall. A volvelle is a wheel chart, not one of those plastic horns they blow at soccer games.

A flap is a flap, not to be confused with Jeff Leonard’s one flap down home run trot in the 1987 NLCS.

A pop-up is any book with three-dimensional pages, including both of the above, but not something that triggers the infield fly rule.

Finally, a globe gore is a sector of a curved surface that lies between two close lines of longitude on a globe and may be flattened to a plane surface with little distortion, a gore being a triangular or tapering piece of material, not the name of Quentin Tarantino’s next movie.

Among the highlights, there was a pop-up book showing Pinocchio and Geppetto emerging from the whale’s mouth, but not one of Tommy Lee Jones emerging from the alien bug’s innards near the end of Men in Black.

There was a glass-enclosed book that was upside down, on purpose, because, I was told, the volvelle inside the book was upside down for some unknown reason. I’m wasn’t sure how a wheel could be upside down, but I let it ride.

There was a Civil War battle plan map with flaps to show the progress of the battle, there apparently being no computer programs available at that time.

There were paper cut-out nesting dolls that didn’t look anything like Natasha Lyonn.

And my favorite, books depicting flowers that were flaps that could be lifted to reveal naked women, handy for use in public places, so as not to create an additional flap.