Kirigami (切り紙) is a variation of origami, the Japanese art of folding paper.
In kirigami, the paper is cut as well as being folded, resulting in a three-dimensional design that stands away from the page.
The book achieved enough success that the word kirigami was accepted as the Western name for the art of paper cutting.
[1] Typically, kirigami starts with a folded base, which is then unfolded; cuts are then opened and flattened to make the finished design.
Simple kirigami are usually symmetrical, such as snowflakes, pentagrams, or orchid blossoms.