Here I show you how to make origami icosahedron from 30 sonobe pieces.
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Step 1: Fold Post-it in Half Glued Side Inside
Step 2: Fold Bottom and Top in the Center
Step 3: Fold Both Corners on the Upper Line
Step 4: Wrap It Up
Step 5: Fold the Corners Over
Step 6: Make a Square and Fold It Into Triangle
Step 7: Make 30 Sonobe Units
Step 8: Place Three Units Together to Form a Triangular Pyramid
Make them in cycle of 5.
Step 9: Build It - It's Like a Puzzle
Just form triangles and you will see form shaping.
Step 10: Alternative Method for Building
You can also build 2 cycles of 5 pyramids separately. In one of them connect middle from pyramids and then connect the top from ready cycle of 5 pyramids.