Drawing the Great Icosahedron
Step 7. Draw  the heavy black lines as shown.
Step 8. Draw  the heavy black lines as shown.
Step 9. Draw in the heavy black lines as shown.
Step 10. Draw the five points as show. Measure
10mm. along the lines to locate the ends of the star
points
The Great Icosahedron final design
without the construction drawing lines
and the decagon outline. Strengthen
the lines of the Great Icosahedron for
maximum effect. If you want to you can
add to your design by adding more
lines to create additional shapes.