Modern origamists prefer to use the pure single sheet origami. Using only Origami paper, no glue, and no scissors. Using more than one sheet of paper is acceptable only if all the sheets of paper were the same size and no glue was used in the process. In the 50's and 60's a group comprised of creators and folders established and international origami group to promote the popularity of origami. The Envelope - using a square piece of paper make diagonal folds down the center in both directions. Open the paper and bring each corner up to the middle. The Picture Frame - First make the Envelope. Open the envelope; turn each corner up to the outer diagonal line. Now fold the four corners inward and you have a picture frame. There are hundreds of sites filled with valuable tips and advice about choosing and completing origami projects. There are sites which provide free origami diagrams and instructions for you to download and print. There are sites where you can buy origami materials and order books written by serious origamists. Gifts: Colorful paper frames, bandanas or handkerchiefs folded into flowers or birds, lace envelopes to hold your personal note, delicate lace birds to hold your valentine, cranes (a symbol of luck) as a mobile or garland like string, book covers, book marks and dozens of other unusual gifts that you can be sure they won't get two of! They have studied and found amazing similarities between tessellations and origami (tessellations is the name for a figure comprised of a shape that is repeated over and over again with no gaps or overlap when fitted to a flat surface). Teachers around the world have used origami to teach different concepts in chemistry, physics and architecture as well as math. However if you'd like to learn more about origami before attempting your first project, why not log onto the Internet and take a look at just what you are signing up for. There are hundreds of origami-related websites. Some of these sites are created by people who use origami as a hobby. Other sites are created by serious origamists, people who are considered to be origami artists.