he's an oragami designer and the two meet at an international oragami event. through trial and error they figured out how to use it in math classes. >> i can fold a piece of paper. i'm in control. it's my body that's making it. my hands, my eyes, my brain. there's a fantastic sense of achievement even if you do the simplest thing when you're five years old. >> reporter: this is animated video that shows how teachers can use oragami. students must figure out the angles of each corner. this is a right angle so it's 90 degrees. they others are 45 degrees. >> they never forget it. it's important because they use the hand, hearing, golding. they use many sense. it's what makes them to understand it better. >> reporter: now about 120 kindergartens use oragami to learn geometry. >> translator: now we know there are many advantages to using oragami in class. for example, we have noted that teach teers who do not like to teach geometry begin teaching with enthusiasm. >> i think there's a lot more to discover. that's why i love this art. >> reporter: because of her tire