Kelli Anderson is a graphic designer whose works on paper don’t stay flat on a table. Previously she’s made, among other things, a paper record player and a paper camera. Her newest project, This Book Is a Planetarium (Chronicle, $40), is not so much a pop-up book as it is a book of pop-up mechanisms. In addition to being a planetarium that can project the autumn night sky on your ceiling, it’s also a decoder ring to encrypt secret messages, a spiralgraph to create unique designs, a smart phone speaker, a perpetual calendar, and a paper lyre. Each contraption is accompanied by easy-to-understand explanations of why and how they work. In addition to its contents, the book itself is a stunningly engineered object and beautiful, too. As you open each page, the colors pop at the same time the gadget unfurls. The sturdy cardboard construction will hold up well to repeated use and two elastic bands are cleverly positioned to hold the book open when investigating each device. Get ready to be amazed and delighted.