When Is A Book Not A Book?

when it morphs into a planetarium,

 and that is not all,

as well as giving a light show of the stars, this pop-up extravaganza transforms into six fully functional tools,

 a speaker, 

 an infinite calendar and message decoder,  

 a musical instrument complete with strings for strumming, 

 a geometric drawing generator,

this is all of them,

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, the book, This Book Is A Planetarium can be ordered here, what a neat present for one of the kids.