1) Fold a square piece of paper in half twice as shown above. Be sure printed side of paper is on the outside. 

2) Open into a half sheet and fold one side into a triangle. 3) Unfold the triangle and push in the top edge to reform the triangle with the flap on the inside. 4) Repeat steps 2 and 3 for the other side of the rectangle to create a double layered triangle. 

5) Fold the left and right tips of the top layer to meet
the upper point of the triangle. 6) Flip the paper over and repeat step 5 on the other side. 7) Fold the left and right tips of the top layer to meet at the center slit. 8) Flip the paper over and repeat step 7 on the other side. 

9) Fold the tip of the top left flap down and tuck it into the
into the left hand triangular pocket. 10) Repeat step 9 on the right hand side. 11) Flip the paper over and repeat steps 9 and 10 on the other side. 12) Blow hard into the hole at the bottom to inflate the ball. 
copyright 2001 Images by Martin R. Carbone, Inc.; Text by MIT 2.009 
