Origami can be very basic such as the simple folds required for a paper airplane. However this activity, when used as an art can become very complex. As people are become interested in origami, they begin to look for more challenging projects, those that demand plenty of thought, creativity and imagination. The geometry involved in the piece is something you could easily see in the creases displayed on the opened paper. Scientists and artists have studied these geometric aspects as well as origamists and mathematicians. Mathematicians throughout time have developed ways to use geometry to define origami; they have designed highly sophisticated models using fundamental theorems. With just one piece of paper an individual can create numerous beautiful and complex compositions. They type of paper used for origami would depend on the project. For simple projects such as a paper airplane or a crane, normal copy paper (19-24lbs) is sufficient. For people who are learning this art, using normal copy paper would likely be a smart idea since it would be less-expensive than buying fancy origami paper. If you have some cloth napkins with an oriental print you can make mini kimonos to grace the plates. Small paper dragons, pigs, rabbits and tigers become chop stick (or knife) rests, or attach them to your place cards for a decorative touch that your guests can take with them. Picnics: A large plastic cloth can be folded into a picnic basket then unfolded and used as a tablecloth or picnic blanket when you are ready to dine. However for those who know little about origami, they may be astounded to see what can actually be made from a single dollar bill. It's amazing what a dollar bill can get you by simply making a few simple folds. There is plenty of available material about origami including books and publications about money origami. A project starts out with just a square piece of paper and can be transformed into countless beautiful compositions. For many people origami is not simply a pastime. This activity requires skill and knowledge and is often used in the business world. There are individuals who get paid to create certain items using the art of origami.