Step 1: Fold the Square Into a Triangle
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Start with a square sheet, colored side down. Fold it corner to corner so you get a triangle, then press the crease flat with your finger or a bone folder. Open it and fold the other diagonal the same way. You want two clean creases crossing at the center. Sharp creases now save you trouble later, so take your time on these first two folds.
Tip
Line the corners up exactly before you press. A tiny gap here throws the wings off later.








