The fun models in this booklet employ two action mechanisms. The first uses pleats to make eyes and mouth open and close, and the second uses reverse-folds to make facial features pop-up. The models are all fold-able using simple letter-size copy-paper (to see how to obtain letter-size paper from other sizes, see here). This book will be entertaining for kids, who will enjoy following the instructions and then coming up with their own variations, using ideas and hints given by the author in the end of the book.