Things You'll Need:
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Step 1
Fold one sheet of rectangular construction paper from the bottom edge to its perpendicular side. Crease the fold, and then cut off the excess part that is not folded. You will be left with an equilateral triangle, which should then be folded in half to make a smaller, right triangle.
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Step 2
Unfold the paper to show an equilateral triangle with a perpendicular crease running down the middle. Fold the left and right corners towards the perpendicular fold to create a small kite-like shape with two smaller triangles. Then, fold those two smaller triangles again towards the perpendicular crease. It should now look like a very narrow kite with two slots.
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Step 3
Fold the two top ends of the kite down, and then unfold them. They will turn into two pointed ends which can be tucked into the slots. Doing so will create the blade of the origami kunai knife.
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Step 4
Roll another sheet of paper lengthwise. Flatten both ends but leave the center area hollow to give the image of a kunai handle.
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Step 5
Tape the kunai blade to one end of the rolled handle. You have now made an origami kunai knife. Repeat the process to make several knives.
