Energy field book
An energy field book was a type of book that resembled a traditional paper book, but would make its story "come to life" - i.e. create physical manifestations of story characters - when it was opened.

While performing anomaly consolidation duty on the  in 2381, Ensign D'Vana Tendi found an energy field book of Three Little Pigs in Doctor Migleemo's office. When she opened the book, it manifested large, aggressive versions of the titular pigs, who proceeded to wreck the office. ()
 Energy field book