How to Make Origami Envelopes
The art of origami can be used to fold sheets of paper into envelopes. While you can just fold a sheet of paper in on itself and seal it together lightly with glue to make an envelope, if you want to make a true origami envelope, with no sealant, you will need to fold it in a way so it tucks in on itself and closes naturally. With this, you can turn the letter itself into its own envelope.
Instructions
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Fold the bottom edge of the paper to the top edge. If you are using the paper on which you wrote the letter, fold it so the writing is on the inside of the fold.
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2
Take the edge in front of you and fold it down in half, then fold that fold back up; you'll have one part folded into eighths near the bottom center. Take the bottom crease of the most recent fold and fold it up to the middle.
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Fold the top half down so its edge touches the crease of your last fold and unfold it. Fold the bottom corners so they touch that same crease. Fold the sides inward along the vertical edges of your corner folds and then unfold all of these folds.
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Make diagonal creases in the small rectangles that your previous creases formed near the top middle along both sides. These creases should point toward the paper's top edge.
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Open up all the folds except the original one and the 1/8 fold on the original bottom edge. The paper should now be just folded in half with the front edge tucked into the paper.
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Open and fold the sides of the front fold, using the corner creases at the bottom, so you have two triangles folded and pointing downward and two squares on top of a rectangle in the center. Fold the very top part of the squares/rectangle down along its existing crease.
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Fold the two sides back in along the existing vertical creases while pulling out the folded triangles. Tuck those triangles in on themselves to form a type of upside-down Y shape running down along the paper.
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Locate the horizontal crease in the top half of the paper; fold the top corners so they line up with that crease, then reopen the folds. Push the top corners down and into the paper along your diagonal creases, forming a trapezoid-like shape at the top.
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Fold and tuck the top end down and into the folds in the middle to close the envelope.
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