Studying the creases of existing models has led to the creation of many new models. These creases show definite patterns of triangles, rectangles and other shapes. The geometric study of the crease lines over the last twenty-five years has paved the way for the discovery of new bases. Not all designs are combinations or parts of other bases; some like the box pleat are completely original. Although the experts can't agree on where origami originated, most of them agree that the Japanese are the ones who developed the traditional art form. This art form was passed down from generation to generation with nothing in writing. Due to all information being passed on orally, only the simplest designs were passed on. First practiced by the Chinese and Japanese, the art of paper folding was and continues to be popular in many cultures. When it was originally started, origami instructions were passed on verbally. Over the years the details and steps required for origami projects have been written down and/or relayed through diagrams. It's also a bonus when origami is being taught by a psychologist because any time a person feels the need to share their feelings, there's a professional there to intervene. The art of origami is effective in promoting positive behavior. In a group setting it helps an individual learn how to act appropriately in a social environment. Working out the intricate patterns in different projects can be quite tedious. Not just anyone will have the patience to continuously fold a piece of paper attempting to create a particular object. For people who design origami projects, the mathematics of it all can be very frustrating and again would definitely require a patient individual. They need to be capable of forecasting the outcome of each step of the origami process. If a mistake is made or a step is skipped, it is quite helpful if the person can figure out where they went wrong. Again patience is needed since an origami project or particular portions of the project may need to be repeated several times.