Never has humble paper had such radical ambitions. Defying every expectation of what a book can be, this pop-up extravaganza transforms into six fully functional tools: a real working planetarium projecting the constellations, a musical instrument complete with strings for strumming, a geometric drawing generator, an infinite calendar, a message decoder, and even a speaker that amplifies sound. Artist Kelli Anderson contributes enlightening text alongside each pop-up, explaining the scientific principles at play in her constructions and creating an interactive experience that's as educational as it is extraordinary. Inspiring awe that lasts longafter the initial pop, This Book Is a Planetarium leaves readers of all ages with a renewed appreciation for the way things work--and for the enduring magic of books.