Top corner
20cm x 20cm Fold and unfold along the diagonals Fold the edges to the crease and unfold Valley-fold vertically and unfold Note the reference points Fold the top corner down Mountain-fold in half...
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30cm x 30cm Fold along the diagonals and unfold Bring the right corner to the center and make a pinch mark Fold the right corner to the pinch mark you just made Repeat on the left side Fold the top...
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