Twenty sided ball made from greeting cards

Step 7 Start paperclipping together

Start with the string and the five circles that will make the top. Tie the string onto a paper clip just so it doesn't pull out so easily. With the string being at the middle point, paper clip the folded flaps together. The middle point where the string comes out will have the corners of all five circles coming together. This is where all these flat circles begin to take on a three dimensional shape. Do the same with the bottom five circles.