The specific tutorial is as follows:

First, prepare a square colored paper, fold it diagonally, and fold the lower two sides in line with the crease. ?

then unfold it, fold it into a small triangle, and fold the other half equally. ?

continue to turn the page, fold it into a quadrilateral, and align the top, bottom and right sides to fold.

then unfold, pinch the crease and fold it into a hexagon with the middle tilted.

press and fold the raised part in the middle to both sides, and thin the upper and lower sides.

finally, continue to fold the middle part downward, and the upper part will be shorter and thinner.

So Sasuke's blade of grass is folded.

Sasuke's blade of grass: the blade of grass (くさなぎのつるぎ) is a kind of fitting in the comic book Naruto. Kusanagi sword in Naruto is a kind of sword rather than a specific sword.