It helps them develop reading and writing skills, teaches them about sequencing, as well as teaching them to concentrate, be patient, be attentive and use their imagination. Because children tend to change their minds quite often, choosing origami as a hobby is a smart choice since it is relatively inexpensive. The answer is to this question is simple - any currency is suitable for money origami. So it doesn't matter which airport or restaurant you are waiting in, you can always pull out a paper bill and attempt money origami. Instead of visiting the gift shops and spending money, you can sit back, play with your money and save in the process. The enjoyment that goes along with this activity is definitely good therapy. Not everyone is quick to open up and share their feelings with another individual, even a psychologist or other medical professional. It's essential that the person administering help and advice present a non-threatening image. Origami paper can also be bought with both sides colored (usually two different colors) and with designs and patterns on it. Complex projects frequently used different types of foil paper in origami. One type, usually sold commercially is foil-back paper. This particular paper is very strong and provides an excellent working base for complex origami. Some origamists saw the base as a set of areas each independent of the other differing only in their length and arrangement. With this in mind they went on to develop computer programs that are capable of doing all the math necessary to generate crease patterns for any base from a given length and area arrangement. This concept was discovered or invented hundreds of years ago in China and Japan. Although it's unknown exactly where origami was first used, this activity was and continues to be an important part of the Japanese culture. An activity that involves folding a piece of paper has been for generations used both as a pastime and as a challenge.