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. Modern origami has progressed to what it is today in great part due to a man named Yoshizawa Akira who in the early 1950's published books containing all new figures. In collaboration with San Randlett, an American, he developed the diagram symbols that are still used today. Today Yoshizawa is remembered as the grandmaster of origami and there are thousands of origami lovers worldwide. People are using this concept to create sculptural art. Individuals who are using this idea as a form of art are creating their own designs. Many of these origami compositions are displayed in art galleries. There's enough interest in this activity that there are origami competitions held. Individuals who are really skilled and serious about origami work quite hard to design and create complex objects to be showcased and judged at competitions. It's an inexpensive activity that a parent and child or children can do together. This means time spent together and an opportunity to build a good parent/child relationship. When people first began practicing the art of origami, they probably had no idea of the amazing benefits this activity would produce. For many origami figures you will need to add another book figure - open the paper and make another fold across the middle horizontally again, making sure the edges lie one on top of the other. If you don't open the book before making the second fold you end up with the handkerchief fold which gives you a small square with four layers of paper one on top of the other. To be able to take a simple concept such as paper folding and watch it make a difference in people's lives is awesome. Origami is a learning experience that incorporates communication skills and problem solving skills. It's also a great activity to promote goal setting. Finishing an origami project takes time but the results are beautiful and fulfilling.