Origami is known as the art of paper folding, developed first in Japan thousands of years ago. In the most traditional sense, simple to intricate models are made from a single square piece of paper, entirely by folding. Non-traditional paper sizes are used in such off-shoots as Letter and Envelope Folding and Money Folding. Multiple pieces of paper are used in Modular models, while cutting is a part of Origamic Architecture. Models can even take flight as with Paper Airplanes.