Never before has humble paper had such radical ambitions. This pop-up extravaganza defies all expectations of what a book can be, transforming into six fully functional tools. Artist Kelli Anderson provides enlightening texts for each pop-up, explaining the scientific principles behind her constructions and creating an interactive experience that is as educational as it is extraordinary. Inspired by awe that lingers long after the first opening, "This Book Is a Planetarium" leaves readers of all ages with a renewed appreciation for how things work and for the enduring magic of books. This book is an interactive experience for both adults and children, transforming into: a functioning planetarium book that projects constellations onto ceilings and walls, a musical instrument with strings to pluck, a geometric drawing generator, an infinite calendar, a message decoder, and a speaker that amplifies sound. If you enjoyed Matthew Reinhart's "A Pop-Up Book of Nursery Rhymes" and Robert Sabuda's "Encyclopedia Prehistorica Dinosaurs: The Definitive Pop-Up," you will love "This Book Is a Planetarium." This collection of cool pop-up fun is the perfect gift for roommates, whether for girls or boys, and falls into the following book categories: pop-up books for adults, pop-up science books, and books about paper toys.