Take a square paper.
Fold it from the center joining the two sides equally.
Open the paper and fold the one side to the center. Do the same with another.
Open it. You can see the paper divided into 4 equal parts.
Take a scissor and cut one side out, as we need only three.
Then fold the remaining three divided portion paper into half.
Take the corner of the folded paper and fold it diagonally. Do the same with the opposite side.
Then open the folded paper from inside (making it look as a house)
Do the same with the other side (placing the first fold below).
You will get an open free flap in the center.
Turn it upward. (take care that it should not disturb the upper part of the object)
Then fold the side of the object and crease hard.
Do the same with the other side.
Open both the sides and bring the folded flap in the middle down. And here is your Origami chair for you.