Never has humble paper had such radical ambitions. Defying every expectation of what a book can be, this pop-up extravaganza transforms into six<em>fully functional</em> 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 long after the initial pop, <em>This Book Is a Planetarium</em> leaves readers of all ages with a renewed appreciation for the way things work—and for the enduring magic of books.