Here is a trick for young mathematicians. You can take the flat surface of a sheet of paper and transform it into three dimensions. You'll see how Eric makes folds and cuts of scissors to achieve something impressive! It's not magic ... it's mathematical! The pedagogical side: This segment presents paper engineering: the art of making folds of paper by following the rules of origami with an ordinary sheet. Then we fold again and we make some scissors cuts to create a three-dimensional object.